Tagged for later, this outta' be good.

Star Fox 64 took somewhere between 45 minutes and 1.5 hours to beat, if I'm not mistaken. It was a long time since I completed it though, so I'm uncertain. It also depended slightly on skill and the route you took.

Fable 2 took me 15 hours to beat

Took me 13 hours to complete the first  playthrough. I finished every quest I found. Because I had a corrupt safe file I never tried to go for a second or third playthrough. 

Dantes Inferno- 8 hours on ps3
Dirt 2- 25 hours for 100 percent complete on ps3
Jak and Daxter: The Lost Frontier- 10 hours
Call of Duty: Modern Warfare 2- 5 hours

Fallout 3 50 hours.

Tomb Raider Legend seems way off. I beat it in 6 hours first time through but it can be beat in 4.5.

I think it took me about 65 hours to beat Suikoden V and get all 108 stars of destiny.

I'll definitely have to return to this thread once I find my old memory cards.

What does that mean to get all 108 stars of destiny? Is that like a 100% completion?

Uncharted 2 - 9 hours (normal difficulty)
Mass Effect 1 - 18 hours (finished about 50% of the side quests)

I need to finish more games >.>