Inspired by a comment in this week's podcast, what games have you played for 100 hours or more? Why?
As someone who typically wants to play far too many games at one time, reaching 100 hours is a really big deal (hell, reaching over 20 hours is a big deal most of the time!)
Dota 2 - 1065 hours
I used to be a little ashamed of this, but then I realised...That's 5 years worth of social nights with good friends. Regular patches shake up the meta a lot, so every 6 months it feels like a whole new game.
Dungeons of Dredmor - 172 hours
I love the sense of humour - vegan vampires, mathemagicians, reading from the book of necronomiconomics (the study of economic principles of the dead), mana literally being booze (the old wizards were simply alcoholics). Very tight turn-based roguelike gameplay, and so easy to mod! There's a tonne of content here, and the community brings so much more into it.
Overwatch - 220 hours
Similar to Dota. I probably wouldn't play this if I didn't have a great group of friends. It's as much about pushing payloads to me as it is hanging out with mates and having a beer or two. A few hours each night after work last year really added up!
Company of Heroes - 200-250 Hours
Back when internet cafes and Xfire were still big, this was my game. This is all I played. Never finished the single-player, but those countless multiplayer matches in dimly-lit, grimy 'net cafes bring back fond memories. Still one of the few games to really focus on squad positioning and clever use of cover. Time is estimated from the last time I checked Xfire before it shut down.
World Of Warcraft - On and off since vanilla. Use your imagination.
There may be more if I dig through my early teenage Gamecube/Nintendo DS library but that's going a little bit too far back (Soul Calibur 2, Smash Bros Melee, Advance Wars, Pokemon, Jump Ultimate Stars come to mind as possible candidates).