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.

Xenoblade 162 hours, that is all i can give you, but it is my longest played game since SNES-days. I know i have spent hundreds of hours on several NES and SNES games

· Dark Souls -> 135 hours (100% completion)

mmm...

· Fallout: New Vegas -> 90 hours.

aaand... I guess Gears of War 3 had to clock somewhere 100-200 hours into it.

World of Warcraft playing a bit of late Vanilla, Burning Crusade , Wrath of the Lich King and Cataclysm.

Overall play time counting every character was at 215-280 days.....don't remember anymore. This shit was addicting lol!

I must have played over 500 hours in Call of Duty 4.

Well the only one i can prove is DOTA 2 - 267 hours according to steam.

But IMO, i've spent more than 1000 hours on DOTA 1. Which i think was the most time I've spent on any game. Beating out Diablo 2, mario, and Pokemon!

In my life, probably SimCity 4. I played it a few months ago last time.

If you add up all the games in the series, FIFA would take no.1 though.

If only I could count the amount of time I played the original StarCraft. - I mean I played that for at-least an hour every day for almost 10 years.

Americas Army Operations 2388 Hours (according to battletracker and my main account)
Guild Wars Over 1k Hours

That's kinda it. I usually get bored quickly. (I have high hopes for AA 4 :))

Ridge Racer V - 10years

Counter Strike 1.3 and 1,6 - 10years(pro:)

lol