Reminder balloon lifetime
Computer Configuration\Administrative Templates\Network\Offline Files
Determines how long updated reminder balloons are displayed.
Reminder balloons appear when the user's connection to a network file is lost or reconnected and are updated periodically. By default, the first reminder for an event is displayed for 30 seconds. Then, updates appear every 60 minutes and are displayed for 15 seconds. You can use this policy to change the duration of the update reminder.
This policy appears in the Computer Configuration and User Configuration folders. If both policies are configured, the setting in Computer Configuration takes precedence over the setting in User Configuration.