check out Gamasutra's analysis where you'll find some other interesting figures, like how much time is spent online and which ages are playing.
The time spent gaming statistic, if you thinking about it, isn't a measure of which platform has the most "r33l gamerz" (is "r33l" a thing? if not, we're starting it) but what people are buying the consoles for. A look at time spent watching DVDs and Blu-ray's (27 percent on PS3 vs 11 on 360) reminds us that there are probably plenty of non-gamers that just bought the box as a cheap Blu-ray player padding the numbers.
So, the consoles all do different things and different people love them for different reasons. It's a veritable rainbow of useful applications and applicators. It's ... crap, you're already commenting, aren't you?