I had a graphic designer working with me and used his own MBPMacBook Pro in 2010, he claims that he bought his MBP forMacBook Pro 3 years [2007 i guess]prior (that'd be 2007, I guess).
He used the MBPMacBook Pro for photoshopPhotoshop, wireless during working hour, and his MBPMacBook Pro really did last him for 6-7 hours.
But after I got my MBPMacBook Pro and reading many commentcomments from my MBPMacBook Pro-using friend and over the internetInternet, seems like we are squeezing the MBPMacBook Pro to just get a little improvement. I guess 7 hours is an historical index and not applicable into new MBP. just that Apple never update this historical datafor newer MacBook Pros.