Most hours spent on one game?

dota 2 5600 hours
csgo 3400 hours
football manager 540 hours

1000 on Arma 3 but I got 3000 on Garry's Mod. I should prolly stop.

Rainbow six, i am so fucking addicted i cant stop playing because it is such a nice game

Has to be world of warcraft, I'm actually scared to go find out my full /played time after 15years

About 600 in Rainbow Six Siege but put all my gaming together you'll probably in at around 10k hours maybe more.

Over 1000 in arma 3. That s in about 3 years and doing just milsim.

Too many hours to remember in the UT mod - Infiltration.

If your looking for a really good new UT mod, check out Ground Branch.

From one of the directors of Rainbow Six and Raven Shield.

Just hit 3k hours on Rust. It gets boring at times but on a fresh wipe, it can get fun.

Ragnarok online. Been playing since 2002. More or less around 5k+ hours.

Terraria - 600 hours
Splatoon 2 - 400 hours
Factorio - 1000 hours