Asklemmy

4000 hours in the Sims, Sims2, Sims3 and 4. Around 8000 in WoW Retail and around 2000 in RimWorld.

I'm at around 1750 hours playing The Binding of Isaac and I'm not done with the game......

Probably GTA Vice City back in the day. So much room to just dick around and kill random people.

On Steam it's Phantasy Star Online 2 (which I am no longer actively playing.)

Throughout my life it's probably Sonic Robo Blast 2 (a fangame.)

Mass Effect Trilogy. Each game when I initially played had 3-4 careers of 50 hours. This was when one game’s choices affecting another game to this degree was very new so I would be trying many different permutations.

Definitely the case if we include LE later on.

Mario Kart.

Minecraft. I spent a lot of time on it, especially when playing with friends on my server.

I had over 10,000 hours of Call of Duty 2 (2005 version). 4000 hours of the first Call of Duty Modern warfare and currently have 3600 hours of Csgo. It’s common to run into 6-8000 hour accounts in Csgo.

Anything less than 1000 hours in Csgo is considered new to the game still.

Got around 300+ hours into Borderlands 2 and around 600+ into Warframe

XCOM 2

This depends on what you define as in game. According to Steam, I've spent the most time on NGU Idle at 3306 hours, but a large amount of that was spent with the game running while I was asleep or at work. For Steam games with the most hours, I've spent 840 playing Path of Exile but that doesn't include the 200 or so hours playing the standalone client. This is followed up by 440 hours playing Terraria (which doesn't include console version hours), and Realm of the Mad God which I have 325 hours playing.

If we include MMOs in the mix, I've easily clocked 1500 hours playing both World of Warcraft (between Classic and Retail up to and including Mists of Pandaria) and Guild Wars 2 over the years.

Funny enough, I wouldn't include any of these games in a list of my favorite games other then Terraria, so that's good to keep in mind :)

Ark: Survival Evolved. I'm at just under 1000 hours, and Rocksmith 2014 I'm at 466 hrs.

Hollow knight ~110h

1. Doom I and II with who knows how many hours since Christmas 1996.

2. Minecraft since 2011.

3. Binding of Issac with close to 1k hours.

4. Factorio with 850+ hours and currently rising.

Terraria and Path of Exile

I'd say Final Fantasy XIV, around 4000 hours

Planetside 2

10 years and counting

Starport GE

15 years and counting

I'm at like 900 hours in Core Keeper

Diablo 2, mostly back in the early days, but resurrected is still fun

MF sorc and Uber killer pally ftw

Swtor

On steam it's dota 2 with about 3k hours but really my most played game is the old f2p Combat Arms. I nearly exclusively played that game after school to bed for like 4 years, I probably had over 6000 hours logged. Still talk with the friends I made there a decade later.

Any of the Championship Manager games.

Grim Dawn with 800+ hours. Slay the spire is 2nd with 600+ hours

DS1 to DS3, I lost count of the hours.

Near enough 3000 hours on destiny 2 and g-mod in second with 992 hours. And third is advanced warfare multiplayer woth 699

Soul Sacrifice

Team Fortress 2 with over 1,200 hours. I've been playing it regularly for over a decade, so the hours have added up

Guildwars2, 14000+ hours. Mostly WvW.

CounterStrike. Haven’t played in years but there was a while when it consumed my free time.

Guild Wars 2 by far, 10k hours. Followed by Wow and Civ 5.

GTA series in general, and GTA V in particular.

I’ve yet to come close to my record of 800+ hours in Rust with any other game.