Which is the game you've played more hours ?

Compared to most posted here, mine is nothing, but:
No Man's Sky - about 550 hours. I'm getting ready to try the new updates after being away for a year or two.

Warframe 2.5K+, but that doesn't count non Steam hours. Probably a lot more than that on EQ and WoW, but who was counting hours back then.

400 hours in 100% Orange Juice on Steam, use to play it while watchng videos/movies

Outside Steam it's probably League of Legends or Maple Story, I think I played more than 2000 hours with those.

Life - 28 years old and still going strong :)

CS:GO with 667 hours

Paladins - 511 hours

Warframe - 1320 hours

Just over 200 hours on Ascension, but I know HotS is my go-to game. Measuring that one in years, not hours.

It'd really be League of Legends or some old MMOs I used to play, but if we are talking on Steam, Stardew Valley - 487 hours.

Terraria 804hrs but slightly cheating cause siblings played it too and added roughly 100-200hrs between them

If you're talking about only on steam it would probably be The Binding of Isaac.(Both versions combined I have over 1000 hours) If you mean over my lifetime of gaming in general its probably Super Mario World.

On Steam? 997 hours in Borderlands 2
Most overall? Well into the thousands back when I played EQ2.

Payday 2 - 639hs
Although Spiral Knights is getting close...

Rocket League - 1435 hours.

It's either Civilization 2 or The Sims. As for Steam statistics, that would be The Witcher 3 with 261 hours (two thorough walkthroughs).

PlayerUnknownBattlegrounds I played for over 2000 hours .. I can't believe I lost so much time in a game without anticheat .....

killing floor 2 - 2337 hours
factorio - 872 hours
7 days to die - 591 hours (mostly achievement hunting, that pathetic piece of shit eternal early access game)

afaik minecraft has no global play time counter but it's easily 1000 - 2000 hours for me i'd guess.

Counter-Strike: Global Offensive: 3095 horas :D

TF2 - 1600+ hours

Battle Brothers -727 hrs

Metin2 16668h [Non steam]
SMITE 6,201 hrs on record[Played some time without Steam]
Call Of Duty 2 5k hours [Non steam ,i miss xfire]

Yu-Gi-Oh! Duel Links - 9775 hrs

Eve has more than a year of my life. I try not to think about it.