What are your TOP 10 most played Steam games in hours?

I was wondering when FM was gonna crop up, thats easily my most played. But it would be the 2013 version.

Only started up PC gaming again back in August(last time was back in the 90's), so I'm really only just getting started. So far:

Assetto Corsa - 48 hours

Fallout New Vegas - 43 hours

Borderlands 2 - 40 hours

The Witcher - 36 hours

Dark Souls - 32 hours

The Witcher 2 - 27 hours

Bioshock Infinite - 20 hours

F1 2013 - 15 hours

Anno 2070 - 12 hours

Might and Magic: Clash of Heroes - 11 hours

Assetto Corsa is just amazing for a sim racing fan like me. Doesn't even have multiplayer or a campaign or anything yet and its still incredibly addictive. This'll eat up hundreds of hours easily.

Just started on my 2nd playthrough of Borderlands 2, so that will probably be close to 75-80 hours all said and done.

Also having a lot of fun with Anno 2070, but I'm essentially still just a beginner(first Anno game) and have many hours ahead of me I'm sure.

My Steam library is already over 200 games strong and I have soooo much to play and catch up on after years of playing on consoles.

EDIT: Also, while its not Steam, I've also got 32 hours in Battlefield 4 and 21 hours in Mass Effect 3 on Origin.