To be honest, I really don't. Unless my memory on my system won't be able to support anymore games, I usually don't bother having a limit. Usually I only play games that I really have fun playing. And I'm not that picky about the games I play. With the exception of no FPS's, except Metroid Prime and Minecraft if you can call it one. I have a lot of games that I love playing. And sometimes you'll see me jumping game to game multiple times in a single hour. So, yeah, I really don't have a limit.