It took about 60 minutes to download and install iOS 7 via Over The Air (OTA). I did have one glitch however. I got to a point where the Apple Logo was showing with out any progress bar below it Waited 5 minutes and the logo disappeared into a blank screen. I waited a few minutes and pressed the home button and the logo reappeared then disappeared again in 5 minutes. Waited 20 minutes and nothing had changed so I tried a hard reset and now all is good. I've been playing with iOS 7 for the last couple hours and like it so far and have not run into any apps that didn't work with the new software. I just finished downloading and installing iOS 7 on my iPhone 5 this time via iTunes with no problems and it took about 45 minutes from start to finish. So far, looking good. I will add to this thread if I run into any problems in the next few days. Now for the Wife's 4S.