Fixing non-second timedelta64 bug #394

Job	Run time
mypy	3m 51s
py3.13 \| macos \| integration tests	6m 14s
py3.13 \| macos \| unit tests	6m 14s
py3.13 \| ubuntu \| integration tests	6m 14s
py3.13 \| ubuntu \| unit tests	6m 13s
py3.13 \| windows \| integration tests	5m 59s
py3.13 \| windows \| unit tests	5m 57s
py3.10 \| ubuntu \| integration tests	6m 13s
py3.10 \| ubuntu \| unit tests	6m 13s
py3.11 \| ubuntu \| unit tests	6m 14s
py3.12 \| ubuntu \| unit tests	6m 15s
merge-test-artifacts	1s
	1h 5m 38s

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