Handle bad interval for cron schedule #6544

Job	Run time
Build / WordPress	2m 48s
Upgrade from ${{ matrix.wp }}	0s
Upgrade from 6.8 / PHP 8.4 with MySQL 8.4	1m 37s
Upgrade from 6.7 / PHP 8.4 with MySQL 5.7 multisite	1m 4s
Upgrade from 6.9-RC1 / PHP 8.4 with MySQL 5.7 multisite	1m 3s
Upgrade from 6.9-RC1 / PHP 8.4 with MySQL 8.4 multisite	1m 10s
Upgrade from 6.7 / PHP 8.4 with MySQL 8.4	1m 37s
Upgrade from 6.9-RC1 / PHP 7.2 with MySQL 5.7 multisite	1m 29s
Upgrade from 6.8 / PHP 7.2 with MySQL 5.7 multisite	1m 33s
Upgrade from 6.8 / PHP 8.4 with MySQL 5.7	1m 9s
Upgrade from 6.9-RC1 / PHP 8.4 with MySQL 5.7	1m 1s
Upgrade from 6.7 / PHP 7.2 with MySQL 5.7	1m 11s
Upgrade from 6.7 / PHP 8.4 with MySQL 5.7	1m 38s
Upgrade from 6.7 / PHP 8.4 with MySQL 8.4 multisite	1m 9s
Upgrade from 4.9 / PHP 7.2 with MySQL 5.7	1m 36s
Upgrade from 6.7 / PHP 7.2 with MySQL 5.7 multisite	1m 39s
Upgrade from 6.9-RC1 / PHP 7.2 with MySQL 5.7	1m 10s
Upgrade from 6.8 / PHP 8.4 with MySQL 8.4 multisite	1m 34s
Upgrade from 4.9 / PHP 7.2 with MySQL 5.7 multisite	1m 28s
Upgrade from 6.8 / PHP 7.2 with MySQL 5.7	1m 2s
Upgrade from 6.8 / PHP 8.4 with MySQL 5.7 multisite	1m 5s
Upgrade from 6.9-RC1 / PHP 8.4 with MySQL 8.4	1m 37s
Slack Notifications	0s
Failed workflow tasks	0s
	29m 40s

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