Reverting back to float for time and dt inside pset.execute #1141

Job	Run time
py3.12 \| ubuntu \| unit tests	3m 34s
py3.11 \| ubuntu \| unit tests	3m 13s
mypy	0s
py${{ matrix.python-version }} \| ${{ matrix.os }} \| integration tests	-1s
merge-test-artifacts	0s
	6m 46s

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