I know that Guild Wars has taken over 120 hours of my time in total. Dungeon Master and Captive have likely taken a lot of my time, as has Advance Wars and Advance Wars 2. I have bouts of new game playing, where I play one game and stick to it for days and days, so there are probably quite a lot of games I've played for a long time. ANY game that you can find where you can unlock more stuff or play it endlessly, like RPGs, I've played ages. I guarantee I've played all of the Dynasty Warriors combined for probably a year straight XD