Ever since two years ago, I haven't been playing many video games, with the exception of Civilization IV. (And no, I mean the game with the mods -- specifically Rise of Mankind. I suggest playing the game with that mod, if anybody is actually interested.) When I play it, it may actually be an entire day, if I'm not doing anything else. I've probably spent weeks on that game, but, if I'm playing any other game, it's only about one to two hours. I guess replay experience really does matter.
I used to be really bad with it, hours and hours but that was back when I was doing tournaments. I don't play every day now, and when I do maybe half an hour to an hour.
It depends on what im playing, i usually lose interest quite easily. But sometimes i can stay stuck to the screen for like 5 hrs.