I wouldn't use NSTimer. I'd create a NSDate "startDate" ivar in the app delegate and in didBecomeActive, set it to the current date. Then in willResignActive, find the difference between the start date and the current date using timeIntervalSinceDate. Then, check whether a time interval has already been stored in NSUserDefaults, if no just save it to NSUserDefaults. If yes, get the stored time interval and add it. Then save it.
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