Most hours spent on one game?

Almost 2000 hours on Smash Bros

Damn, people on here with thousands of hours spent on one game... I thought my 462 hours in Trails in the Sky SC was a lot.

I had played Warframe for almost 3k hours when I quit it (due to bugs/bad interactions with mods and devs)
Second place goes to Fallout 4 probably, with 1600 hours

most hours ? is probably apex legends like almost 2000 hours and vrchat around 1500 hours

CS 4k hours total
played on different accounts playing in comp and faceit best fps game till this day

Dota 2 with 1900 hours total

Probably like 18-20 hours a day when I used to be hooked on Pokemon growing up haha

I'm playing Garry's Mod since 2018, but i am already have ~4000 hours in it.

Counter strike global offensive

3500+ on league of legends