Most hours spent on one game?

dota 2 with over 2k hours. I hate it that I love that game...

200 hours call of duty mobile

About 3k hours on warframe with another 1k on final fantasy xiv. Both hreat games

1-Garry's Mod 1720 Hours
2-Dota 2 1400+ Hours

I have probably logged over 300 hours into The Witcher 3. But I bet I have put more time into something like Fallout 3 orHalf-Life 2 over the years in all the various versions of it.

Csgo over 1k hours tf2 the same and Garrys mod 1.3 k hours

The ones I got recorded are 2k hours on CS:GO, and 1,5k hours on GTA Vbut I technically have like 3k hours on GTA SA and Lineage II, neitheron Steam.:D

CS:GO ~522
Minecraft ~800
CS 1.6 ~1000

I have nearly 2k hours in Warframe I probably had over 5k hours in all of Halo on console back in the day.

650 hrs on tf2, 700 on cs:go, and 200 on payday 2