default run length => default run time #76

Job	Run time
1/4	13m 7s
2/4	12m 4s
3/4	13m 32s
4/4	16m 42s
py-3-latest	25m 4s
flaky	6m 49s
_remote_background_indep_poll	5m 10s
_remote_background_indep_tcp	7m 30s
macos 1/5	21m 46s
macos 2/5	20m 27s
codecov	0s
	2h 22m 11s

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