Most hours spent on one game?

I had about 400 hours on Battlefield 5 but later just quit the game.

Boodborne 2 I have spent hours and hours on hahaha

spent 3k hours on dota 2, and this game really fun to play with friends lol

CSGO : 1.2k
tf2:3k
ARMA 3: 700
DayZ 2k
CSS: 5k

1200 hours on destiny stopped playing once i saw how much time i wasted

CK II and EU4 (both about 1000h). I like grand strategy games a lot

Counting the hours across all platforms, 2,470 hours on Rainbow Six: Siege.

300+ hrs of Unturned, stopped playing because i had to play other games too

World of Warcraft most definitely. Across all expansions, I probably have months of playtime.

tomb raider, the one where lara goes to russia , if forgot the full name. 150 hours at least.