I spend a heck of a lot of time playing PC games, but I mostly just play a single game obsessively and extensively over a few months or years. I thought I played XCOM 2 a lot, because I started and restarted many campaigns of the infamously slow and long "Long War 2" mod (as well as the original Long War). Indeed, I have spent over 1 month of my life in XCOM 2 according to Steam, yet it pales in comparison to Stellaris.
I'm willing to bet, up to 10 HBD, that nobody reading this has played a game for longer than I've played Stellaris - at least not with verifiable play time.
If you think otherwise and are willing to make a wager, reply to my post. Tell me what game you've played more hours, and how much HBD you're willing to bet. We may need to become friends on Steam (sharing by encrypted message) to verify each other's hours.
The offer will stay open until someone wins against me or this post pays out.