An event can be set to trigger at regular intervals. You can have a script run every minute, or turn off a device every 5 minutes. When setting the trigger to recurring, you can check the checkbox reference to hour. This will cause the interval to be an offset from the hour. This can be used to set a recurring trigger to happen every 15 minutes, and it will trigger 15 minutes past the hour, 30 minutes past the hour, 45 minutes past the hour and on the hour. If the interval was set to 5 minutes, it will trigger at 5 minutes past, 10 minutes past, etc. Reference to hour is ignored if the interval is over 60 minutes.
Note that the event will always trigger on the hour.
If you want the event to trigger only on the hour, set the interval to 60.
Figure 9 Recurring Trigger