There are times when you want a trigger to turn itself off after a set period of time. This is easy to do using the interface by following the steps below:
1) From your list of Triggers, click the "Edit" link for the trigger you would like to modify.
2) To the right of the "Status" drop-down click the link labeled "more options..."
3) A drop-down labeled "Stops" will appear.Set the drop-down to the desired setting. Default options are to stop after one day, one month, and one year.
The "custom..." setting will allow you to specify a date.
4) Click "Edit Trigger" at the bottom of the page to save your changes.