Fixing non-second timedelta64 bug #395

Job	Run time
mypy	3m 56s
py3.13 \| macos \| unit tests	6m 36s
py3.13 \| macos \| integration tests	6m 39s
py3.13 \| ubuntu \| integration tests	6m 38s
py3.13 \| ubuntu \| unit tests	6m 36s
py3.13 \| windows \| integration tests	6m 20s
py3.13 \| windows \| unit tests	6m 27s
py3.10 \| ubuntu \| integration tests	6m 38s
py3.10 \| ubuntu \| unit tests	6m 36s
py3.11 \| ubuntu \| unit tests	6m 37s
py3.12 \| ubuntu \| unit tests	6m 40s
merge-test-artifacts	1s
	1h 9m 44s

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