How many hours!? Let's see. Well, it depends on which kind of games I'm playing. Some are so enticing, the storyline in particular, that you feel that mere 2-3 hours won't be enough, so you'd want to spend some more time with the game. Also when you're playing any game for the first time, it is pretty interesting, right, so you stretch your usually allotted time in order to see what comes next. That was the case with me when I was playing Prince of Persia for the first time. I always wanted to see what would happen next. Hats off to the storyline.
When it comes to games that you take as challenge, particularly hard ones that you have already dreamt of playing and completing then also the time schedule won't work. You have to spend more time with your challenging games. You have to prove that you can also do it like a pro. That's the whole make of how our gaming times are allotted and spread throughout the whole day. I think noone can change that.