The only game i can put a definite number on is Hyrule Warriors at 185 hours

World of Warcraft. Should be around 200 days playtime!

A few thousand hours on Doom.

Still play it ocassionally.

Yeah, I started getting into Zelda on the Christmas of 2013. So basically, I've only been playing it for a year and a couple months. It's quickly become my favorite series. Almost done playing all the 3D games, and then I have all the retro 2D ones to go through.

holy shit dude

The combined hours of my time playing Pokemon is something like 1000 hours (Ruby, Emerald and Diamond)

I don't think I've spent that much time on all of the games I've ever played combined.

I'm impressed.

A little over 1K hours for Mario Kart Wii.

More than that for Roller Coaster Tycoon, but I'm not sure of an exact number.

Mario Kart Double Dash and Super Smash Brothers Melee each have at least 600 hours.

And a few hundred hours for various multiplayer games and Zelda games.

Also, over 100 hours for Wii Music, arguably my most impressive.

Interesting one, with newer games and steam around its pretty easy to tell how long, but for older games not so much. Here are just a few of mine I am 90% sure about the times..

Demon souls - 500+ hours

Dark souls - 2500+ hours

Dark souls 2 - 1500+ hours

Ultima online - 7 years ^^ 

Pokemon. Usually 300 hours each game. I own nearly every version. I don't have S, C, Plat, HG, SS, W, B/W2, Y. 5000 hours = 200 days.