Asklemmy

Metin2 my whole childhood. Then Minecraft and Counter Strike

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.)

Chose to live the DINK life, loving it.

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.

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.

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

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

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 :)

Hollow knight ~110h

I racked up about 9000 hours in WoW before quitting, bit over 3000 hours in Runescape.

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.

I'm at like 900 hours in Core Keeper

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

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

MF sorc and Uber killer pally ftw

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.

Swtor

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

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

Pokemon Emerald

Any of the Championship Manager games.

GTA series in general, and GTA V in particular.

War Thunder, approaching 10,000 hours. One day I'll get good!

Soul Sacrifice

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

4000 in arms 3 1000 in TF2 Around 2000 in osrs

Jesus Christ, didn't realise it was that bad. I just wish I was any good at any of them

DS1 to DS3, I lost count of the hours.

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

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