After years of being my most played game EQ2 was finally surpassed. Last time I tracked EQ2 I was at close to 1500 hours played. Combining both Farm Sim 2013 and Farm Sim 15 my playtime is just over 1700 hours. I think WoW is third with around 1000 hours. No idea how many hours AC2 accumulated as it was before apps that tracked game time.
Farm Sim 15 is due to release its expansion at the end of the month so I imagine I will be adding to that time. Still hard to believe a farm simulator has kept my interest far far longer than pretty much any other game.
Just looked and I have played Farm Sim 15 almost as many hours as it would take to play all the games in my Steam Library to completion.