Currently Being ModeratedMay 2, 2012 2:54 PM (in response to theunknown87)
Apple does not repair iPhones, they replace them. The only exceptions are backplates for the 4/4S and possibly the battery.
If you're going to an Apple store and have an appointment, you should be in and out in under an hour.
If you're sending the device to Apple, well, they should be able to tell you the turn around time.