The winner, coming in over 60 hours, is Demon's Souls. Just beat it last month, and loved every minute of it. Even those frustrating, throw-the-controller-at-the-TV minutes  

Other than that, I didn't play many long games this year. They were mostly short 10-20 hour affairs. The second-place game, believe it or not, might have been Super Mario Galaxy 2. With over 200 stars to collect, it took a good chunk of time.

Diablo 3 (XONE) over 250 hours
Peggle 2 - Over 35 Hours
TitanFall (XONE) over 35 hours

Assassin Creed 3 (WiiU) - over 20 hours
Mario Kart 8 - 15 hours

Mario Kart 8 - 200 Hours
Smash Bros - 100 hours combined
League of legends - an insane amount

1. Hearthstone (Around 170)
2. Mario Kart 8 (Around 60)
3. Diablo 3/Reapers (Around 50)

I generally don't like long games. I do however like games that i can play for long in bite size chunks. 

1. Destiny
2. NBA 2K15
3. TLoU: Remastered

Crusader Kings 2 is probably what I sank the most hours in to. That, GTA V, and Resident Evil 4.

1. Destiny
2. Dragon Age Inquisition
3. Mario Kart 8
4. Super Mario 3D World
5. Infamous Second Son

Don't have exact number of hours, but approximately:

1. MLB 14 The Show

2. FIFA 14

3. Destiny

4. Watch Dogs

5. Far Cry 4

Diablo III - 200+ hours

I have four classes now 70+ and play up into the torment difficulties. Beat the game five times, now do rifts and greater rifts mostly. Always better loot.

Mario Kart 8
Metal Gear Solid (series)
Deus Ex: Human Revolution

Shenmue (way too long haha)