diff --git a/library/src/actions/index.ts b/library/src/actions/index.ts
index 78c0f37bd..84dc72cbd 100644
--- a/library/src/actions/index.ts
+++ b/library/src/actions/index.ts
@@ -33,6 +33,7 @@ export * from './ipv4/index.ts';
 export * from './ipv6/index.ts';
 export * from './isoDate/index.ts';
 export * from './isoDateTime/index.ts';
+export * from './isoDuration/index.ts';
 export * from './isoTime/index.ts';
 export * from './isoTimeSecond/index.ts';
 export * from './isoTimestamp/index.ts';
diff --git a/library/src/actions/isoDuration/index.ts b/library/src/actions/isoDuration/index.ts
new file mode 100644
index 000000000..5d7d61757
--- /dev/null
+++ b/library/src/actions/isoDuration/index.ts
@@ -0,0 +1 @@
+export * from './isoDuration.ts';
diff --git a/library/src/actions/isoDuration/isISO8601Duration.ts b/library/src/actions/isoDuration/isISO8601Duration.ts
new file mode 100644
index 000000000..8fdadfc8c
--- /dev/null
+++ b/library/src/actions/isoDuration/isISO8601Duration.ts
@@ -0,0 +1,36 @@
+const ALTERNATE_FORMAT: RegExp = /^[-+]?P\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}$/;
+const PERIOD_REGEX: RegExp = /\./g;
+const COMMA_REGEX: RegExp = /,/g;
+const WEEK_PART: RegExp = /\d+W/;
+const DATE_PARTS: RegExp = /\d+[YMD]/;
+const DATE_PARTS_ORDER: RegExp = /^(\d+([\.,]\d+)?Y)?(\d+([\.,]\d+)?M)?(\d+([\.,]\d+)?D)?(\d+([\.,]\d+)?W)?$/;
+const TIME_PARTS_ORDER: RegExp = /^(\d+([\.,]\d+)?H)?(\d+([\.,]\d+)?M)?(\d+([\.,]\d+)?S)?$/;
+
+export const isISO8601Duration = (input: unknown): boolean => {
+  if (!input || typeof input !== 'string') return false;
+  if (!input.startsWith('P') || input === 'P' || input === 'PT') return false;
+
+  if (ALTERNATE_FORMAT.test(input)) return true;
+  
+  const totalDecimalPeriods = (input.match(PERIOD_REGEX) || []).length;
+  const totalDecimalCommas = (input.match(COMMA_REGEX) || []).length;
+  if (totalDecimalPeriods > 0 && totalDecimalCommas > 0) return false;
+
+  const parts = input.substring(1).split('T');
+
+  if (parts.length > 2) return false;
+
+  const datePart = parts[0];
+  const timePart = parts[1];
+
+  if (timePart === '') return false;
+
+  const hasWeeks = WEEK_PART.test(datePart);
+  const hasOtherDateParts = DATE_PARTS.test(datePart);
+  if (hasWeeks && hasOtherDateParts) return false;
+
+  if (datePart !== '' && !DATE_PARTS_ORDER.test(datePart)) return false;
+  if (typeof timePart === 'string' && timePart !== '' && !TIME_PARTS_ORDER.test(timePart)) return false;
+
+  return true;
+}
\ No newline at end of file
diff --git a/library/src/actions/isoDuration/isoDuration.test-d.ts b/library/src/actions/isoDuration/isoDuration.test-d.ts
new file mode 100644
index 000000000..06ca96921
--- /dev/null
+++ b/library/src/actions/isoDuration/isoDuration.test-d.ts
@@ -0,0 +1,43 @@
+import { describe, expectTypeOf, test } from 'vitest';
+import type { InferInput, InferIssue, InferOutput } from '../../types/index.ts';
+import { isoDuration, type IsoDurationAction, type IsoDurationIssue } from './isoDuration.ts';
+
+describe('isoDuration', () => {
+  describe('should return action object', () => {
+    test('with undefined message', () => {
+      type Action = IsoDurationAction<string, undefined>;
+      expectTypeOf(isoDuration<string>()).toEqualTypeOf<Action>();
+      expectTypeOf(
+        isoDuration<string, undefined>(undefined)
+      ).toEqualTypeOf<Action>();
+    });
+
+    test('with string message', () => {
+      expectTypeOf(isoDuration<string, 'message'>('message')).toEqualTypeOf<
+      IsoDurationAction<string, 'message'>
+      >();
+    });
+
+    test('with function message', () => {
+      expectTypeOf(
+        isoDuration<string, () => string>(() => 'message')
+      ).toEqualTypeOf<IsoDurationAction<string, () => string>>();
+    });
+  });
+
+  describe('should infer correct types', () => {
+    type Action = IsoDurationAction<string, undefined>;
+
+    test('of input', () => {
+      expectTypeOf<InferInput<Action>>().toEqualTypeOf<string>();
+    });
+
+    test('of output', () => {
+      expectTypeOf<InferOutput<Action>>().toEqualTypeOf<string>();
+    });
+
+    test('of issue', () => {
+      expectTypeOf<InferIssue<Action>>().toEqualTypeOf<IsoDurationIssue<string>>();
+    });
+  });
+});
diff --git a/library/src/actions/isoDuration/isoDuration.test.ts b/library/src/actions/isoDuration/isoDuration.test.ts
new file mode 100644
index 000000000..8ef62422f
--- /dev/null
+++ b/library/src/actions/isoDuration/isoDuration.test.ts
@@ -0,0 +1,157 @@
+import { describe, expect, test } from 'vitest';
+import type { StringIssue } from '../../schemas/index.ts';
+import { expectActionIssue } from '../../vitest/expectActionIssue.ts';
+import { expectNoActionIssue } from '../../vitest/expectNoActionIssue.ts';
+import { isoDuration, type IsoDurationAction, type IsoDurationIssue } from './isoDuration.ts';
+import { isISO8601Duration } from './isISO8601Duration.ts';
+
+describe('isoDuration', () => {
+  describe('should return action object', () => {
+    const baseAction: Omit<IsoDurationAction<string, never>, 'message'> = {
+      kind: 'validation',
+      type: 'iso_duration',
+      reference: isoDuration,
+      expects: null,
+      requirement: isISO8601Duration,
+      async: false,
+      '~run': expect.any(Function),
+    };
+
+    test('with undefined message', () => {
+      const action: IsoDurationAction<string, undefined> = {
+        ...baseAction,
+        message: undefined,
+      };
+      expect(isoDuration()).toStrictEqual(action);
+      expect(isoDuration(undefined)).toStrictEqual(action);
+    });
+
+    test('with string message', () => {
+      expect(isoDuration('message')).toStrictEqual({
+        ...baseAction,
+        message: 'message',
+      } satisfies IsoDurationAction<string, string>);
+    });
+
+    test('with function message', () => {
+      const message = () => 'message';
+      expect(isoDuration(message)).toStrictEqual({
+        ...baseAction,
+        message,
+      } satisfies IsoDurationAction<string, typeof message>);
+    });
+  });
+
+  describe('should return dataset without issues', () => {
+    const action = isoDuration();
+
+    test('for untyped inputs', () => {
+      const issues: [StringIssue] = [
+        {
+          kind: 'schema',
+          type: 'string',
+          input: null,
+          expected: 'string',
+          received: 'null',
+          message: 'message',
+        },
+      ];
+      expect(
+        action['~run']({ typed: false, value: null, issues }, {})
+      ).toStrictEqual({
+        typed: false,
+        value: null,
+        issues,
+      });
+    });
+
+    test('for valid ISO Durations', () => {
+      expectNoActionIssue(action, [
+        'P1Y',
+        'P3M',
+        'P2W',
+        'P5D',
+        'PT8H',
+        'PT30M',
+        'PT10S',
+        'P1Y6M',
+        'P3Y4M2D',
+        'P2DT12H',
+        'PT1H30M',
+        'PT1H30M45S',
+        'P1Y2M3DT4H5M6S',
+        'P0Y0M0DT0H0M0S',
+        'PT0S',
+        'P1Y0M',
+        'P0Y3M',
+        'P10Y',
+        'PT36H',
+        'PT0.5S',
+        'PT1,5H',
+      ]);
+    });
+  });
+
+  describe('should return dataset with issues', () => {
+    const action = isoDuration('message');
+    const baseIssue: Omit<IsoDurationIssue<string>, 'input' | 'received'> = {
+      kind: 'validation',
+      type: 'iso_duration',
+      expected: null,
+      message: 'message',
+      requirement: isISO8601Duration,
+    };
+
+    test('for empty strings', () => {
+      expectActionIssue(action, baseIssue, ['', ' ', '\n']);
+    });
+
+    test('for missing prefix', () => {
+      expectActionIssue(action, baseIssue, [
+        '1Y2M',
+        'T30M',
+        '5D3H',
+        '3Y6M2DT12H30M'
+      ]);
+    });
+
+    test('for invalid order', () => {
+      expectActionIssue(action, baseIssue, [
+        'P1M2Y',
+        'PT30S15M',
+        'P3D2M1Y'
+      ]);
+    });
+
+    test('for missing T separator', () => {
+      expectActionIssue(action, baseIssue, [
+        'P1Y2M3D4H5M6S',
+        'P5D10H',
+        'P10Y3M5D1H'
+      ]);
+    });
+
+    test('for duplicate designators', () => {
+      expectActionIssue(action, baseIssue, [
+        'P1Y2Y3M',
+        'PT5H6H',
+        'P1Y2M3D4Q',
+        'P1Y2MT3HZ',
+      ]);
+    });
+
+    test('for mix-matching with W designator', () => {
+      expectActionIssue(action, baseIssue, [
+        'P1Y2Y3M1W',
+        'P3WT5H6H'
+      ]);
+    });
+
+    test('for mix-matching , and .', () => {
+      expectActionIssue(action, baseIssue, [
+        'P1.1Y2Y3MT2.5D',
+        'P1,5YT5.1S'
+      ]);
+    });
+  });
+});
diff --git a/library/src/actions/isoDuration/isoDuration.ts b/library/src/actions/isoDuration/isoDuration.ts
new file mode 100644
index 000000000..883e2823b
--- /dev/null
+++ b/library/src/actions/isoDuration/isoDuration.ts
@@ -0,0 +1,109 @@
+import type {
+  BaseIssue,
+  BaseValidation,
+  ErrorMessage,
+} from '../../types/index.ts';
+import { _addIssue } from '../../utils/index.ts';
+import { isISO8601Duration } from "./isISO8601Duration.ts";
+
+/**
+ * ISO duration issue interface.
+ */
+export interface IsoDurationIssue<TInput extends string> extends BaseIssue<TInput> {
+  /**
+   * The issue kind.
+   */
+  readonly kind: 'validation';
+  /**
+   * The issue type.
+   */
+  readonly type: 'iso_duration';
+  /**
+   * The expected property.
+   */
+  readonly expected: null;
+  /**
+   * The received property.
+   */
+  readonly received: `"${string}"`;
+ /**
+   * The validation function.
+   */
+ readonly requirement: (input: TInput) => boolean;
+}
+
+/**
+ * ISO duration action interface.
+ */
+export interface IsoDurationAction<
+  TInput extends string,
+  TMessage extends ErrorMessage<IsoDurationIssue<TInput>> | undefined,
+> extends BaseValidation<TInput, TInput, IsoDurationIssue<TInput>> {
+  /**
+   * The action type.
+   */
+  readonly type: 'iso_duration';
+  /**
+   * The action reference.
+   */
+  readonly reference: typeof isoDuration;
+  /**
+   * The expected property.
+   */
+  readonly expects: null;
+  /**
+   * The validation function.
+   */
+  readonly requirement: (input: TInput) => boolean;
+  /**
+   * The error message.
+   */
+  readonly message: TMessage;
+}
+
+/**
+ * Creates an [ISO duration](https://en.wikipedia.org/wiki/ISO_8601) validation action.
+ *
+ * Format: P[n]Y[n]M[n]DT[n]H[n]M[n]S
+ *
+ * @returns An ISO duration action.
+ */
+export function isoDuration<TInput extends string>(): IsoDurationAction<
+  TInput,
+  undefined
+>;
+
+/**
+ * Creates an [ISO duration](https://en.wikipedia.org/wiki/ISO_8601) validation action.
+ *
+ * Format: P[n]Y[n]M[n]DT[n]H[n]M[n]S
+ * 
+ * @param message The error message.
+ *
+ * @returns An ISO duration action.
+ */
+export function isoDuration<
+  TInput extends string,
+  const TMessage extends ErrorMessage<IsoDurationIssue<TInput>> | undefined,
+>(message: TMessage): IsoDurationAction<TInput, TMessage>;
+
+// @__NO_SIDE_EFFECTS__
+export function isoDuration(
+  message?: ErrorMessage<IsoDurationIssue<string>>
+): IsoDurationAction<string, ErrorMessage<IsoDurationIssue<string>> | undefined> {
+  return {
+    kind: 'validation',
+    type: 'iso_duration',
+    reference: isoDuration,
+    async: false,
+    expects: null,
+    requirement: isISO8601Duration,
+    message,
+    '~run'(dataset, config) {
+      if (dataset.typed && !this.requirement(dataset.value)) {
+        _addIssue(this, 'duration', dataset, config);
+      }
+      return dataset;
+    },
+  };
+}
diff --git a/website/src/routes/api/(actions)/isoDuration/index.mdx b/website/src/routes/api/(actions)/isoDuration/index.mdx
new file mode 100644
index 000000000..d8aad2eb7
--- /dev/null
+++ b/website/src/routes/api/(actions)/isoDuration/index.mdx
@@ -0,0 +1,73 @@
+---
+title: isoDuration
+description: Creates an ISO duration validation action.
+source: /actions/isoDuration/isoDuration.ts
+contributors:
+  - fabian-hiller
+  - muningis
+---
+
+import { ApiList, Property } from '~/components';
+import { properties } from './properties';
+
+# isoDuration
+
+Creates an [ISO duration](https://en.wikipedia.org/wiki/ISO_8601#Durations) validation action.
+
+Patterns:
+- `P[n]Y[n]M[n]DT[n]H[n]M[n]S`
+- `P[n]W`
+
+> This supports ISO 8601 format. Mix-matching W with other date parts as per ISO 8601-1, and `+` or `-` prefixes as per ISO 8601-2 are not supported.
+
+```ts
+const Action = v.isoDuration<TInput, TMessage>(message);
+```
+
+## Generics
+
+- `TInput` <Property {...properties.TInput} />
+- `TMessage` <Property {...properties.TMessage} />
+
+## Parameters
+
+- `message` <Property {...properties.message} />
+
+### Explanation
+
+With `isoDuration` you can validate the formatting of a string. If the input is not an ISO duration, you can use `message` to customize the error message.
+
+## Returns
+
+- `Action` <Property {...properties.Action} />
+
+## Examples
+
+The following examples show how `isoDuration` can be used.
+
+### ISO duration schema
+
+Schema to validate an ISO duration.
+
+```ts
+const IsoDurationSchema = v.pipe(
+  v.string(),
+  v.isoDuration('String does not match ISO 8601 Duration format P[n]Y[n]M[n]DT[n]H[n]M[n]S or P[n]W')
+);
+```
+
+## Related
+
+The following APIs can be combined with `isoDuration`.
+
+### Schemas
+
+<ApiList items={['any', 'custom', 'string', 'unknown']} />
+
+### Methods
+
+<ApiList items={['pipe']} />
+
+### Utils
+
+<ApiList items={['isOfKind', 'isOfType']} />
diff --git a/website/src/routes/api/(actions)/isoDuration/properties.ts b/website/src/routes/api/(actions)/isoDuration/properties.ts
new file mode 100644
index 000000000..537d310e9
--- /dev/null
+++ b/website/src/routes/api/(actions)/isoDuration/properties.ts
@@ -0,0 +1,58 @@
+import type { PropertyProps } from '~/components';
+
+export const properties: Record<string, PropertyProps> = {
+  TInput: {
+    modifier: 'extends',
+    type: 'string',
+  },
+  TMessage: {
+    modifier: 'extends',
+    type: {
+      type: 'union',
+      options: [
+        {
+          type: 'custom',
+          name: 'ErrorMessage',
+          href: '../ErrorMessage/',
+          generics: [
+            {
+              type: 'custom',
+              name: 'IsoDurationIssue',
+              href: '../IsoDurationIssue/',
+              generics: [
+                {
+                  type: 'custom',
+                  name: 'TInput',
+                },
+              ],
+            },
+          ],
+        },
+        'undefined',
+      ],
+    },
+  },
+  message: {
+    type: {
+      type: 'custom',
+      name: 'TMessage',
+    },
+  },
+  Action: {
+    type: {
+      type: 'custom',
+      name: 'IsoDurationAction',
+      href: '../IsoDurationAction/',
+      generics: [
+        {
+          type: 'custom',
+          name: 'TInput',
+        },
+        {
+          type: 'custom',
+          name: 'TMessage',
+        },
+      ],
+    },
+  },
+};
diff --git a/website/src/routes/api/(methods)/pipe/index.mdx b/website/src/routes/api/(methods)/pipe/index.mdx
index 533db5d2c..9e24a45d4 100644
--- a/website/src/routes/api/(methods)/pipe/index.mdx
+++ b/website/src/routes/api/(methods)/pipe/index.mdx
@@ -190,6 +190,7 @@ The following APIs can be combined with `pipe`.
     'ipv6',
     'isoDate',
     'isoDateTime',
+    'isoDuration',
     'isoTime',
     'isoTimeSecond',
     'isoTimestamp',
diff --git a/website/src/routes/api/(schemas)/any/index.mdx b/website/src/routes/api/(schemas)/any/index.mdx
index 533243996..3f831b07b 100644
--- a/website/src/routes/api/(schemas)/any/index.mdx
+++ b/website/src/routes/api/(schemas)/any/index.mdx
@@ -7,6 +7,7 @@ contributors:
   - morinokami
   - jasperteo
   - EltonLobo07
+  - muningis
 ---
 
 import { Link } from '@builder.io/qwik-city';
@@ -119,6 +120,7 @@ The following APIs can be combined with `any`.
     'ipv6',
     'isoDate',
     'isoDateTime',
+    'isoDuration',
     'isoTime',
     'isoTimeSecond',
     'isoTimestamp',
diff --git a/website/src/routes/api/(schemas)/custom/index.mdx b/website/src/routes/api/(schemas)/custom/index.mdx
index 31dd4edd9..74fde260b 100644
--- a/website/src/routes/api/(schemas)/custom/index.mdx
+++ b/website/src/routes/api/(schemas)/custom/index.mdx
@@ -6,6 +6,7 @@ contributors:
   - fabian-hiller
   - morinokami
   - EltonLobo07
+  - muningis
 ---
 
 import { ApiList, Property } from '~/components';
@@ -147,6 +148,7 @@ The following APIs can be combined with `custom`.
     'ipv6',
     'isoDate',
     'isoDateTime',
+    'isoDuration',
     'isoTime',
     'isoTimeSecond',
     'isoTimestamp',
diff --git a/website/src/routes/api/(schemas)/string/index.mdx b/website/src/routes/api/(schemas)/string/index.mdx
index 7446e26b0..6370f16f4 100644
--- a/website/src/routes/api/(schemas)/string/index.mdx
+++ b/website/src/routes/api/(schemas)/string/index.mdx
@@ -8,6 +8,7 @@ contributors:
   - jasperteo
   - kazizi55
   - EltonLobo07
+  - muningis
 ---
 
 import { ApiList, Property } from '~/components';
@@ -165,6 +166,7 @@ The following APIs can be combined with `string`.
     'ipv6',
     'isoDate',
     'isoDateTime',
+    'isoDuration',
     'isoTime',
     'isoTimeSecond',
     'isoTimestamp',
diff --git a/website/src/routes/api/(schemas)/unknown/index.mdx b/website/src/routes/api/(schemas)/unknown/index.mdx
index 20b3ae291..50caa034c 100644
--- a/website/src/routes/api/(schemas)/unknown/index.mdx
+++ b/website/src/routes/api/(schemas)/unknown/index.mdx
@@ -119,6 +119,7 @@ The following APIs can be combined with `unknown`.
     'ipv6',
     'isoDate',
     'isoDateTime',
+    'isoDuration',
     'isoTime',
     'isoTimeSecond',
     'isoTimestamp',
diff --git a/website/src/routes/api/(types)/IsoDurationAction/index.mdx b/website/src/routes/api/(types)/IsoDurationAction/index.mdx
new file mode 100644
index 000000000..ab97e342e
--- /dev/null
+++ b/website/src/routes/api/(types)/IsoDurationAction/index.mdx
@@ -0,0 +1,28 @@
+---
+title: IsoDurationAction
+description: ISO duration action interface.
+contributors:
+  - fabian-hiller
+  - muningis
+---
+
+import { Property } from '~/components';
+import { properties } from './properties';
+
+# IsoDurationAction
+
+ISO duration action interface.
+
+## Generics
+
+- `TInput` <Property {...properties.TInput} />
+- `TMessage` <Property {...properties.TMessage} />
+
+## Definition
+
+- `IsoDurationAction` <Property {...properties.BaseValidation} />
+  - `type` <Property {...properties.type} />
+  - `reference` <Property {...properties.reference} />
+  - `expects` <Property {...properties.expects} />
+  - `requirement` <Property {...properties.requirement} />
+  - `message` <Property {...properties.message} />
diff --git a/website/src/routes/api/(types)/IsoDurationAction/properties.ts b/website/src/routes/api/(types)/IsoDurationAction/properties.ts
new file mode 100644
index 000000000..dd80d4149
--- /dev/null
+++ b/website/src/routes/api/(types)/IsoDurationAction/properties.ts
@@ -0,0 +1,106 @@
+import type { PropertyProps } from '~/components';
+
+export const properties: Record<string, PropertyProps> = {
+  TInput: {
+    modifier: 'extends',
+    type: 'string',
+  },
+  TMessage: {
+    modifier: 'extends',
+    type: {
+      type: 'union',
+      options: [
+        {
+          type: 'custom',
+          name: 'ErrorMessage',
+          href: '../ErrorMessage/',
+          generics: [
+            {
+              type: 'custom',
+              name: 'IsoDurationIssue',
+              href: '../IsoDurationIssue/',
+              generics: [
+                {
+                  type: 'custom',
+                  name: 'TInput',
+                },
+              ],
+            },
+          ],
+        },
+        'undefined',
+      ],
+    },
+  },
+  BaseValidation: {
+    modifier: 'extends',
+    type: {
+      type: 'custom',
+      name: 'BaseValidation',
+      href: '../BaseValidation/',
+      generics: [
+        {
+          type: 'custom',
+          name: 'TInput',
+        },
+        {
+          type: 'custom',
+          name: 'TInput',
+        },
+        {
+          type: 'custom',
+          name: 'IsoDurationIssue',
+          href: '../IsoDurationIssue/',
+          generics: [
+            {
+              type: 'custom',
+              name: 'TInput',
+            },
+          ],
+        },
+      ],
+    },
+  },
+  type: {
+    type: {
+      type: 'string',
+      value: 'iso_duration',
+    },
+  },
+  reference: {
+    type: {
+      type: 'custom',
+      modifier: 'typeof',
+      name: 'isoDuration',
+      href: '../isoDuration/',
+    },
+  },
+  expects: {
+    type: 'null',
+  },
+  requirement: {
+    type: {
+      type: 'function',
+      params: [
+        {
+          name: 'input',
+          type: {
+            type: 'custom',
+            name: 'TInput',
+          },
+        },
+      ],
+      return: {
+        type: 'custom',
+        name: 'MaybePromise',
+        generics: ['boolean'],
+      },
+    },
+  },
+  message: {
+    type: {
+      type: 'custom',
+      name: 'TMessage',
+    },
+  },
+};
diff --git a/website/src/routes/api/(types)/IsoDurationIssue/index.mdx b/website/src/routes/api/(types)/IsoDurationIssue/index.mdx
new file mode 100644
index 000000000..57bab9527
--- /dev/null
+++ b/website/src/routes/api/(types)/IsoDurationIssue/index.mdx
@@ -0,0 +1,26 @@
+---
+title: IsoDateTimeIssue
+description: ISO date time issue interface.
+contributors:
+  - fabian-hiller
+---
+
+import { Property } from '~/components';
+import { properties } from './properties';
+
+# IsoDateTimeIssue
+
+ISO date time issue interface.
+
+## Generics
+
+- `TInput` <Property {...properties.TInput} />
+
+## Definition
+
+- `IsoDateTimeIssue` <Property {...properties.BaseIssue} />
+  - `kind` <Property {...properties.kind} />
+  - `type` <Property {...properties.type} />
+  - `expected` <Property {...properties.expected} />
+  - `received` <Property {...properties.received} />
+  - `requirement` <Property {...properties.requirement} />
diff --git a/website/src/routes/api/(types)/IsoDurationIssue/properties.ts b/website/src/routes/api/(types)/IsoDurationIssue/properties.ts
new file mode 100644
index 000000000..6f132d40c
--- /dev/null
+++ b/website/src/routes/api/(types)/IsoDurationIssue/properties.ts
@@ -0,0 +1,72 @@
+import type { PropertyProps } from '~/components';
+
+export const properties: Record<string, PropertyProps> = {
+  TInput: {
+    modifier: 'extends',
+    type: 'string',
+  },
+  BaseIssue: {
+    modifier: 'extends',
+    type: {
+      type: 'custom',
+      name: 'BaseIssue',
+      href: '../BaseIssue/',
+      generics: [
+        {
+          type: 'custom',
+          name: 'TInput',
+        },
+      ],
+    },
+  },
+  kind: {
+    type: {
+      type: 'string',
+      value: 'validation',
+    },
+  },
+  type: {
+    type: {
+      type: 'string',
+      value: 'iso_duration',
+    },
+  },
+  expected: {
+    type: 'null',
+  },
+  received: {
+    type: {
+      type: 'template',
+      parts: [
+        {
+          type: 'string',
+          value: '"',
+        },
+        'string',
+        {
+          type: 'string',
+          value: '"',
+        },
+      ],
+    },
+  },
+  requirement: {
+    type: {
+      type: 'function',
+      params: [
+        {
+          name: 'input',
+          type: {
+            type: 'custom',
+            name: 'TInput',
+          },
+        },
+      ],
+      return: {
+        type: 'custom',
+        name: 'MaybePromise',
+        generics: ['boolean'],
+      },
+    },
+  },
+};
diff --git a/website/src/routes/api/menu.md b/website/src/routes/api/menu.md
index a95aa5110..27be53e60 100644
--- a/website/src/routes/api/menu.md
+++ b/website/src/routes/api/menu.md
@@ -109,6 +109,7 @@
 - [ipv6](/api/ipv6/)
 - [isoDate](/api/isoDate/)
 - [isoDateTime](/api/isoDateTime/)
+- [isoDuration](/api/isoDuration/)
 - [isoTime](/api/isoTime/)
 - [isoTimeSecond](/api/isoTimeSecond/)
 - [isoTimestamp](/api/isoTimestamp/)
@@ -425,6 +426,8 @@
 - [IsoDateIssue](/api/IsoDateIssue/)
 - [IsoDateTimeAction](/api/IsoDateTimeAction/)
 - [IsoDateTimeIssue](/api/IsoDateTimeIssue/)
+- [IsoDurationAction](/api/IsoDurationAction/)
+- [IsoDurationIssue](/api/IsoDurationIssue/)
 - [IsoTimeAction](/api/IsoTimeAction/)
 - [IsoTimeIssue](/api/IsoTimeIssue/)
 - [IsoTimeSecondAction](/api/IsoTimeSecondAction/)