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[BloatedGuppy]

I don't even want to speculate. A lot.

My Steam account currently tracks Civ V as my most played game at ~400 hours, but 25% of that is likely me AFK.

Of course, Steam does not track my MMOs, or any of the myriad of games I played prior to or apart from Steam, many of which are my heavy hitters.

There's a fair number well over 1000 hours. A couple of the longest played MMOs are likely REALLY high. And I was CASUAL compared to some people. Pretty sure there are some people who lived 75% of their waking hours in Azeroth and Norrath for many years.

 

[EscapeGoat_v1legacy]

I think the most I've ever spent on a single game is probably Pokemon SoulSilver. I mean, in general I tend to invest loads of time in the Pokemon games - my current saves on each probably average out to around 100 hours per game, give or take - but I've spent 237 hours on SoulSilver. The only ones to come close to it are Black (202 hours) and Ruby (180 hours). I have invested a lot of time in other games - over 100 hours in Dragon Quest VIII: Journey of the Cursed King and 190-odd in Skyrim but Pokemon SoulSilver easily has them beat.

 

[KB13]

3682 hours 52 minutes and 43 seconds playing Class of Heroes and I still haven't beaten it once, darn you random generator loot I need a coffee table!

 

[Raziel]

I buy a ton of games. So once I beat a game I basically just shelve it and go to the next. So I rarely have a significant amount of time in any game. Skyrim widely atypical for me, it is probably the longest by FAR and thats at 286 hours. Of course with all the sidequest stuff and dlc I've not come close to actually doing everything in it.

 

[Pikey Mikey]

In no particular order:
Baldur's Gate I & II (I in my "youth"/childhood (before I had learnt English (don't ask me how I managed to do anything)) and II some years ago (still think they're great games)).
Dawn of War (Retribution) some 250+ hours, about 225 of those are online matches with my friends.
WoW (of course (started at the BC release, quit several times (subtract a year maybe) and quit before Cata).
Pokémon, just... Fuckin' Pokémon (more than I'd like to know, still, no regrets)

So many hours... No regrets, I'll be a gamer for a looong time to come

 

[Shadow-Phoenix]

It's a complete mix with TF2, C&C red Alert 3, Age of Empires 2 and Plants vs Zombies.

I'm going to safely say TF2.

 

[Hieronymusgoa]

I know I would like to play more, but since I'm working a normal 9-5 it has become a precious thing to spend time on games. Still I know in what I can sink endless hours.
Like with the OP I spent, for my tastes, a good amount of time recently into Dark Souls (around 50 hours), but the stuff which got the most attention is still Civ 5 and League of Legends. Not crazy big heaps of time but I play them since they came out basically and therefore they got a lot of my free time over the years.

 

[twidget]

Just over 1400 hours playing Skyrim, maybe 2000 playing Morrowind.
235 hours Borderlands 2, 127 Fallout New Vegas.
I'd guess 400-450 hours playing Fallout 3.

 

[SadisticFire]

I have 5081 hours in Gmod on my steam account. It definitely seems to be one of the higher ups on this thread. I keep seeing the "THREE HUNDRED DAYS" but that would mean 7200 hours. Which is pretty damn hard to achieve. Assuming you've played for a year, you've spent three hours asleep, and the other twenty one hours playing. Two years would effectively cut it in half, but assuming you're a normal human that gets eight hours of sleep(Which we all arn't) you would still only have five hours to work at a job or be educated at school. Three years I can see it having a possibility, but I think a large portion of people confuse a majority of a day playing a game, to be a whole complete day.
#DontHurtMyGamingEgoPlzItsTheOnlyThingIhavePrideIn.ThatsHeatlhyRight?

 

[Seydaman]

3,200+ hours in Neverwinter Nights 2, never played any of the campaigns,
Can't remember what I logged playing WoW.

 

[Exius Xavarus]

5k+ hours into Guild Wars, ~1200-1300 in Dark Souls.

 

[Xiroh86]

For me Final Fantasy 7 and 8 are somewhere around a minimum of 2000+ hours each.

Metal Gear Solid 3 is pretty high up there too, a couple hundred hours at least.

 

[The_Lost_King]

All I know is that ther is a 99.99% chance it is WoW and I don't know my hours. It would also be inpossible for me to tell how many hours I played since me and my dad shared an account. The other .01% is Oblivion which I am pretty sure I doubled Skyrim's hours(468). I can't see my Oblivion hours because half was on ps3 and the other half was disc bought on pc.

 

[Dominic Crossman]

There are so many games with 100+ hours that I really dont know
At a guess I'd say cod4 as thats all I played for the longest time