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I can’t be sure. There are three contestents; RollerCoaster Tycoon 2, SimCity 4 or Anno 1602. So all old, endless PC games, which I played religiously since release though the last couple of years finally less and less.

I think RollerCoaster Tycoon 2 is most likely the winner. Sadly none if these keep time, and that wouldn’t have been correct anymore after so many computer-swaps anyways, but I think 10,000 hours isn’t an unrealistic claim. However perception of time is different than reality, so it could be a lot less, but still definitely several thousands of hours. No console game ever came close. Of the top of my head Mario Kart 64 is likely the winner there, which may have also reached 1,000, but it’d be barely.