I'm not sure the entire time for each game but here are the stats for game i remember.
FFX - 330 hours.
CoD4 - Over 360 hours for just the online mode, maybe another 20-30 hours for SP.
AoE3 + expansion - 300 to 600 hours.
GTA: Vice city - I can't remember the amount of time, but i remember killing over 100k people. I also maxed out my cash on level 246 of the Brown Thunder mission.