Most hours spent on one game?

Easily over 10k hours on Scareface TWIY on PS2 and around 5k on BOTW . Both of those games are awesome and are my favorite games of all time. In third place id say gta 5 simply because ive beaten the story mode on ps3, ps4, xbox one , xbox 360 and pc .

I play alot of games but i play like over 12 hours a day on different games

World of Warcraft, and i really dont know anymore how much time i spend on official, private and selfmade Servers.
i think its roughly over 3000 hours.

4-5k in CS GO, idk for sure because I've played on multiple steam accounts.

Around 3000 hours in CS:GO and 500 in Garry's mod.
Im currently playing GMOD alot trying to hit the 1k hours :D

The most ive spent on one game is around 5 years on DotA

All you try hards be spending hella time on games. The most Ive ever spent on a game was 5 hours was grinding the heck out of NBA live mobile to get the Elite Jersey (Lmao). Did not go well because I was ranked 340 thought I was safe and quit playing for the rest of the day. Then the next day went to check praying I did not move down a spot, damn game had me placed at 12,000. Smh

Got about 6000 hours spent on Gmod, the closerunner is definitely minecraft

CS 1.6 CSGO in 1st place another one its rust, leauge of legends and world or warcraft

I have spent like 5k hours all together playing gta5 then gave up on it