Cron Every 3 Hours

To run a cron job every 3 hours, use the following cron string:

0 */3 * * *

Let's break down this cron string:

Position 1: 0 means every minute 0
Position 2: */3 means every 3 hours
Position 3: * means every day of the month
Position 4: * means every month
Position 5: * means every day of the week

See more cron examples.