Is anybody able to tell me how long the 13 inch rMPB will last when at normal use, let's say 50% brightness and just doing normal stuff, like browsing on the internet? Is this really 7 hours like apple claims? Because i searched on the web and found one review from macworld.com (Link: http://www.macworld.com/article/201...imal-choice-for-lightweight-laptop-users.html ) but in this case they played a video in a continuous loop and not browsing. I'm asking this, because i'm chosing between an Air full specced, 2.0 ghz, 256gb and 8gb ram (here: 1800,-) and the Retina 256gb (here :2000,-) and battery time is important to me, because i'm taking it with me 3 to 5 times a week to university. Other question: What would you chose? The full speced Air or the 13 inch' rMBP?