One of the Paradox strategy games by a comfortable margin. It'll be one of the Crusader Kings or Victoria games. I've got a weekly game night with a couple of friends that was originally just CK, but has for a while now been working extremely slowly through a megacampaign. You can take the end of Crusader Kings and make it into a mod for the start of Europa Universalis, then repeat the process into Victoria and then Hearts of Iron. You need to set some rules for yourselves, because an experienced player doesn't need even a third of the CK timeline to demolish all AI threats, but the games are already good roleplaying fodder anyway so you can set rules that play into that. We're currently about three quarters of the way through Victoria
Outside of those, Noita or Deep Rock Galactic. For a while, those plus a podcast were my go-to "zone out brain off" relaxation, so the hours racked up
I have few hundred hours in Minecraft. And probably something like 180h in Witcher 3 GOTY. Recently I 100% Yakuza 5 with 120h on the counter, and it was (mostly) fun, because game is packed with many different minigames, so it wasn’t repetetive.
Star Citizen (no joke, I have put more than 2000h in the Alpha...). But because some people may say Star Citizen is not a game (I'm not agree with that statement), the second game I have played the most is warframe (1500h)
But that of course does not include the games not running from Steam and pre-Steam games. So World of Warcraft is somewhere in there too. And the final Top 1 must be Transport Tycoon Deluxe (even if you don’t include OpenTTD).
World of Warcraft is the absolute winner in my case. I have no idea on actual numbers, given 99% of my time was in private servers, with a very brief stint on official. Only one of those private servers is still around, with my character from Warlords of Draenor times still there.
Outside that, probably Skyrim (many hours playing pirate versions, modding it with more lethal combat, more lore-friendly armors and “actual” civil war, among other things). I wonder how many hours I’ve spent on Dwarf Fortress, as I’ve only played the freeware version, starting with 0.34, before trees had height.
I think something like 5k hours into Warframe, 15 years into WoW (at least 2 of my characters have 1+ year of playtime–so 17k hours just on those 2; and I max-leveled every class of character up until Battle for Azeroth) and so far, 2 years into ARK. Just over 3.5k hours of playtime between ASE and ASA.
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