Handle bad interval for cron schedule #32387

Job	Run time
Determine Matrix	3s
Multisite Default / Test current	15m 19s
Multisite Memcached / Test current	16m 6s
Single Site Default / Test current	14m 43s
Single Site Memcached / Test before	14m 59s
Multisite Memcached / Test before	14m 25s
Single Site Default / Test before	15m 13s
Single Site Memcached / Test current	14m 46s
Multisite Default / Test before	14m 48s
Compare / Single Site Default	19s
Compare / Multisite Memcached	18s
Compare / Multisite Default	20s
Compare / Single Site Memcached	24s
Failed workflow tasks	-1s
Slack Notifications	-1s
	2h 1m 41s

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