I discovered today that my most played game on Steam is Astronner with about 500 hours, and my second most played is Surviving Mars with about 500 hours.
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Im not sure about total hours..
But several thousand in WoW. Back during release and for at least 5 years i played like 8 hours per day on avg. I would guess.
I would estimate 10000 - 12000 hours. Maybe a bit more.
I dont play it anymore though.
The game i have most time played on, on steam, would be Gfim Dawn. That game is amazing.