T.D. said:
Simply put, estimated total video game play time. Arcade games, Console games, Handheld, the lot.
I really don't even want to know... BUT!
The hours that Steam tracks adds up to 51.25 days for me. (DCUO, Rusty Hearts, and Dungeon Defenders being the most time spent, all around 240 hours)
That of course doesn't include notable non-steam games; WoW, 2moons, DotA, DAL(BOS), LoL.
WoW I really can't even speculate. I played it probably about 6 hours a day for two months. So 360 hours or 15 days.
2moons... ugh... way too much time, probably near 600 hours or 25 days.
DotA no clue, a lot.
DAL (Darkness and Light, which was similar to DotA but went under). I had about 2000 games (iirc) during its run, luckily games had a time limit of 30 minutes + 5 minute boss fight so it's easy to calculate. So on DAL alone, 48.61 days.
LoL is
probably just as bad, if not worse. I got into the LoL beta in late February 2009. This was back when we could only play during weekends; so I, like many, would go on legit 40+ hour nonstop LoL marathons every weekend. So 6 months of that is 960 hours or 40 days. Of course this doesn't count post beta time which is trickier, but I'd say at least another 40 would be a low estimate. So, minimal of 80 days.
So right now I'm at 219 days (but that doesn't include DotA). Which isn't bad. Except, these are only PC games in the last decade or so, and I've been gaming since I was a wee boy (28 now).
Some games over a decade old, or that I simply overlooked originally;
Age of Empires 2 might very well be the game I've played the most in my life. I'd say 1000 hours at least.
Age of Mythology was probably half that.
Quake 2 would be a huge one, can't even speculate.
Oblivion, hard to say, spent a good amount playing (200 hours maybe), but even more making mods for it.
Planescape Torment I've played through completely 5 times, probably 50 hour average per run.
Everquest and Planetside would account for quite a bit...
Freestyle Basketball is up there (yes, seriously), I'd say 100 hours to be safe.
Phantasy Star Online and Diablo 2 would be pretty big as well, but can't really speculate.
Final Fantasy 7/8/9 are all probably about 60-80 hours a piece.
Also, arcade games aren't included here... When I was a teen I was at the arcade quite a bit, mainly for MvC2 or Tekken Tag. Hard to track hours there because crowd rotation and such.
And again, with a few exceptions I can't really recall console games. I never got a console this generation, but had at least one system every generation til current.
Of course none of this includes the countless 6 hours or so games I've played, especially in the NES/Genesis days. I'm sure there's a few big ticket items I'm forget, I've played so many F2P MMOs it's disgusting. All in all if I had to guess, probably a little more than 2 years of playtime... which is really, really depressing now that I think about...
edit: re-reading this post to correct for errors I realize it's probably significantly more than 2 years, but I might break down and cry if I give it some serious thought.