Run tests

Mention `time_step` in docs where applicable #3683

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Run time

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Job	Run time
test (1, ubuntu-latest)	25m 29s
test (nightly, ubuntu-latest)	38s
test (1.9, ubuntu-latest)	6h 0m 15s
test (1, macos-latest)	11m 20s
	6h 37m 42s