By default, when a supporter is completing an action on a campaign there is a timer that appears on the Your Details page. The timer is by default set to 20 mins and cannot be removed. For supporters who need more than 20 minutes to complete their transaction, they will have the option to extend the timer.
How to Extend the Timer
When the timer reaches 2 minutes, supporters will be prompted with the option to extend the timer. If they choose to extend the timer, 20 more minutes will be added. They can continue to add time at every 2-minute mark until they complete their transaction. This timer extension is automatic and there is no setup required by you.