Cron every few minutes

Short intervals for health checks, cache warming and queue polling. The catch with all of them: a run that takes longer than the interval overlaps the next one. 11 schedules below, each with the exact expression, next five runs, the usual mistake and examples in 8 runtimes.

Every few hours Once a day Weekdays and weekends Once a week Monthly and less often Other patterns

Every minute* * * * *
Every 2 minutes*/2 * * * *
Every 3 minutes*/3 * * * *
Every 4 minutes*/4 * * * *
Every 5 minutes*/5 * * * *
Every 6 minutes*/6 * * * *
Every 10 minutes*/10 * * * *
Every 12 minutes*/12 * * * *
Every 15 minutes*/15 * * * *
Every 20 minutes*/20 * * * *
Every 30 minutes*/30 * * * *