in my iPhone application I need to show local notification. I would like to know is it possible to set a time interval for local notification showing on the screen? For example I would like to show local notification during 20 seconds. I know that local notification is showing while sound is playing. But also I have found out that it is not possible to repeat local notification sound: [UILocalNotification repeat sound](https://stackoverflow.com/questions/3642637/uilocalnotification-repeat-sound)