Moving the time interpolation down to within _Interpolator functions #677

Job	Run time
mypy	3m 27s
py3.13 \| macos \| unit tests	7m 59s
py3.13 \| macos \| integration tests	7m 59s
py3.13 \| ubuntu \| unit tests	7m 58s
py3.13 \| ubuntu \| integration tests	7m 59s
py3.13 \| windows \| unit tests	7m 52s
py3.13 \| windows \| integration tests	7m 44s
py3.10 \| ubuntu \| integration tests	7m 58s
py3.10 \| ubuntu \| unit tests	7m 57s
py3.11 \| ubuntu \| unit tests	7m 57s
py3.12 \| ubuntu \| unit tests	8m 0s
merge-test-artifacts	1s
	1h 22m 51s

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