Depends on the game. When it's not a mmo then it takes about 2hours to a week. To finish the campaign/diff modes in the game. When I play the game only 2hours then it probably sucks and I uninstall it. :P -- We make lan parties from time to time with our little gaming friend group. Then we all take the games we have finished and choose the best to play at LAN.

Basically It's 2h-week + LAN fun, when the game is worth playng as multiplayer ofc.

I play mmo's when there are no other good genre games. I played WoW since the beta non-stop, untill now... STALKER and Tiberium Wars got my interest and I love them. :) -- Sometimes sad to think tho how rare GOOD games are these days, for me at least... this also depends on the person I guess. :p -- I would be happy to play all the games in the world non-stop but the games are not that easy to get like that. :( lol