No, I don't even think 6-7 hours is bad unless I'm flying and even then most seats have plugs these days it's just a pain to have the cables all out. I just noticed the huge disconnect from the 17 hour claim.

Between Chrome and Photoshop my GPU seems to be on pretty much all the time on my MBP. I get probably 5-6 hours on it working unplugged(my power cable is usually at my standing desk and some days I'm lazier than normal so I get close to this before standing up again).