So I've been having problems with my iPhone 4 battery draining while not in use. For example, I can go to bed with it fully charged and wake up with the battery either completely drained or below 40%. I spoke with Apple and they had me try setting the phone up as a new phone instead of using the backup, which did not help. They also had me set up as new again, but this time not syncing apps (in case an app causes the problem). That didn't work either. So it looks like I am going to have to go to an Apple Store to have it replaced since I don't want to go a week without my only phone. It is a few hours away, but I'd rather drive a few hours than wait a week Anyway, roughly how long should I expect a battery replacement to take? Is it a simple job that takes only minutes, or should I expect a longer wait?