I used to open the app store almost every day to see if there were updates to any app, but then they added that automatic update thing. I only just this last week decided to try that and to completely avoid opening the app store. I turned it on in Settings->iTunes and App Store->Update. I'm also on wifi almost all the time, FWIW. All week, nothing. Then, just to see if anything WAS waiting to update, I opened app store and there were two apps with updates from 3/30 wanting to update last night (4/3). So... How long would my phone have waited on its own to finally get those 3/30 updates? A whole week?