I spent the most time playing Final Fantasy 8 where I spent many hours increasing the level of my characters, and collecting all the items necessary for making the different weapons.
I have been sucked into the Warframe story missions for a while. There is something about killing hordes of high-level enemies that gives me this weird dopamine hit that I can't quite explain. It's basically crack, but with space ninjas.
I'm honestly surprised that Age of Empires II isn't higher on the list. You start playing AoE thinking you're only going to be there for like 40 minutes, and before you know it, it's been 3 hours, and you gotta get up to go to work.
I have 2 most played games both on PC, followed by most played on xbox one. First; FFX remaster and NBA 2k22 on PC both have 1,000+ hours however I do not play 2k22 anymore or atleast not at the moment so FFX takes the #1 rank there for pc. Xbox 1 has nba 2k21 at 500 hours; with others coming closer to that mark.