The fact that I don't know exact hours, I'm gonna call it a cross tie between Timesplitters 2, Fallout 3, and Fallout New Vegas. I put in over 800 hours in both Fallout games individually. I don't have any way of finding how much time I put into Timesplitters 2, because I've lost saved data multiple times, and I owned the game for both PS2 and GCN, and put a lot of time into both platforms. I'd venture to guess I have more time into the Timesplitters franchise than all Fallout games combined.