What game have you rack up the most hours playing?

[IsawYoshi]

Pokemon diamond 845 hours (1 playthrough)
Ratchet and Clank 2 170 hours
Endless Ocean 2 150 hours
Pokemon MDBRT 140 hours
Xenoblade 130 hours
Mario Kart Wii 125 hours

I've rounded them up and down since I can't remember the exact play times.