Haven't looked at time played in a long while.
Can't get the time for certain ones, like Doom (which I played a lot in the '90s), WoW, The Sims, Second Life, Star Trek Online, etc.
According to Steam:
Crusader Kings III - 987.4 hours - History Simulator
Cities Skylines - 251 hours (last played 03/11/2021) - City Simulator
College Kings 1 & 2 - 26.6 hours + 14.4 hours - College/University Simulator (18+)
Sid Meier's Civ VI - 33.6 (only counts the time played in 2025) - Civilization Simulator
Desert Stalker - 21.4 hours - Post-Apocalyptic Simulator (18+)
(can seem to find the release trailer for this one off Steam)
Can find the music from the game, and game-play videos, but not release trailer.
Desert Stalker - Arabian Nights
Leap of Faith - 15.5 hours - Slice of Life Simulator (18+)
Drifty Games - Leap of Faith [Game Teaser] - [Music by Daniel Garavini]
Goat Simulator - 6.4 hours (last played 11/6/2015) - Goat Simulator/Zombie Simulator
Goat Simulator Official Launch Trailer
Weird how official release trailers don't really highlight what the game actually has the player do in the game. Like Crusader Kings III kind of implies there is, at least at some point in the game-play, 3D simulation elements. And I want to play whatever game Civ VI is advertising for (Civ VI is not a 3D Simulation game, at least not like in the trailer). Goat Simulator seems closet to actual gameplay.