This would be perfect in conjunction with an "unload" event that triggers the countdown if the user decides to go to a different page on your web site. This way

This would be perfect in conjunction with an "unload" event that triggers the countdown if the user decides to go to a different page on your web site. This way, the user doesn't have to stay on the page to make sure their actions are completed. Instead of forcing the user to wait for the end of the countdown, you can use an "undo" button. Instead of actually undoing the operation, they would just be preventing it from happening in the first place.