I doubt you can finish this game in less than 10. I played through multiple times and every time after the second time I kind of rushed through it just to see the possibilities, and even rushing through it still took me about 2 hours an episode, so at the very worst, it's 10 hours long. Absolutely amazing game. Counting my multiple playthroughs I've easily topped 60 hours with this game so far.
About 2-3 hours per episode - I'd say about 12-15 hours for the whole game. The game has a great story and great characters so it's not a matter of quantity but quality. Plus, the game is only like $20 or so - aren't a lot of $60 games the same length? And you'd want to play the game again since you make a lot of choices. A great game that is easily worth the price tag.
Metal Gear Solid 4 : Guns of the Patriots! (4/15/06) Damn the Patriots!Sneak Out 6.12.08 - SNAAAAKE!