Fixing non-second timedelta64 bug #393

Job	Run time
mypy	4m 3s
py3.13 \| macos \| integration tests	6m 59s
py3.13 \| macos \| unit tests	6m 58s
py3.13 \| ubuntu \| integration tests	6m 55s
py3.13 \| ubuntu \| unit tests	6m 56s
py3.13 \| windows \| integration tests	6m 50s
py3.13 \| windows \| unit tests	6m 50s
py3.10 \| ubuntu \| integration tests	6m 56s
py3.10 \| ubuntu \| unit tests	6m 56s
py3.11 \| ubuntu \| unit tests	6m 55s
py3.12 \| ubuntu \| unit tests	6m 57s
merge-test-artifacts	1s
	1h 13m 16s

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