So a lot of you are Doom addicts, though I figure people have poured a lot of time into other favorite videogames as well. Post what you play and give a general time as to how long you've played if you can.
I have a couple answers, one of which doesn't really count. The longest "time played" I have in a game is the MUD which I run, and even though it's probably the game I've played the most in my life, the hours I've spent connected to it aren't really representative of the time I've played because I keep my staff character connected 24/7. The total online time so far is 51677 hours. Actually what it displays on my character's profile is -13857 hours, because the short integer only goes up to 32767, and then it loops around.
Seeing as I wasn't there for the whole time though, and it's not really a video game in that it's all just text, I'd have to say Civilization IV is probably one of my most played titles. I haven't kept track of how long I've played it for, but probably numbering in the thousands of hours. Not always sustained though, it's a very stop and go game and sometimes I'll ponder a single turn for a half hour, or super late in the game I'll have to wait as much as half an hour for my computer to calculate a single turn (and then hope it doesn't crash once it does.)
My longest recorded played game in Steam is Team Fortress 2 with over 2000 hours logged, but a ton of that was idling back when I still cared about HATS, so, not real playtime.
My second longest recorded game on Steam is Arma 2, mostly for the mod DayZ, which came out early this year, with over 600 hours logged. That was pretty much all active playtime. While it's kind of embarrassing to log that many hours in such a short time, DayZ has kind of become a big part of my social life since moving to a new place. It's got this weird vibe where you meet people and after time form huge bonds of trust through hyper-realistic combat. I know how my squadmates think, we all know what we're going to do before we actually do it, and we can just go in silently and fan out to everyone's predetermined role and make a plan go off without a hitch.
So, everyone else, what do you spend way too much time playing?