Most hours spent on one game?

Don't know the exact amount but definitely several thousands on GTA.

Uhhh i spend 4000 hours in gmod :v 5 years i spend in this game

I have 5,115 hours on Garry's Mod in Steam, o really love play this game xd

Around 2k hours in Skyrim
800 in Gmod
I'm ashamed of it all because real men don't play vidya but what can you do.

CSGO: 5k? Arma3: 3.3k F1 2017: 1k and League of Legends: 2k i think

Diablo 2 15k. This game is my childhood, so many good memories!

If I combine console & pc I probably have around 4k hours on MW2. This game is my childhood, so many good memories!

Have to say that the game I have played the most hours on, bar none, is Elite Dangerous. Over 3500 hours and counting, I still haven't lost my appetite for this beautifully realised and visually realistic adventure sent in a one to one virtual copy of the Milky Way.

It all depends on what you want from a game. With this, I find that I can get in from work, and lose myself in the fantasy of being out in space. Brilliant!

I spent about 4000+ hour on Metin2 back in 2011 as far as 2015

I've spent 5 hours playing BO1, that was my record