Same as above, not a couple of hours since i dont really like gaming on my phone but there are a bunch of games that do very well to kill some time.
The ones i've been playing most lately are
Steppy Pants,
AbyssRium, and
Game of Dice.
The first two don't require an internet connection so they come in handy when youre away from home. The latter is a Online Multiplayer Card Game. Similar to monopoly. But with some RPG elements such as skills and skill cards.
And if you're like me and too into MMORPGs then try out
Toram Online if you turn out to like it, i bet you'll spend hours playing it, like i used to..... but then they started blocking root devices. meh, good things really dont last long ey ?