The Periodic trigger lets you execute a macro at specified intervals while you are logged in.

The Period of the trigger can be set as follows:

• Interval of seconds, minutes or hours.
• Limit to a certain portion of the day, or on particular days of the week.

Caution: Generally it is recommended to not use very frequent intervals (like seconds), except as a last resort. For one thing, a macro triggering will cancel any “once” or conflict palette choices or the like, and so frequent timed trigger macros will likely cause problems with that.

You could use a trigger like this to run periodic maintenance or track changes.

• Cron trigger
• Time of Day trigger
• Idle trigger
• All Triggers