What is Past Reminder Display Duration and how do I use it?
This option allows you to set how long the past reminders are displayed. Whenever reminders are popped up, for an upcoming event or new mail, you must dismiss it. But if there is no user feedback, then the phone will continue to display the reminders until the time specified by the Past Reminder Duration. For example, if the Past Reminder Display Duration is set for one hour, a reminder that is set for 9:00 AM will pop up at 9.00 AM and will stay there until either you dismiss it or 10:00 AM. This prevents old reminders from piling up.