My altered view of MGS4 now that I've beaten it.

[Ail]

There's more than 5 hours of gameplay.
I finished the game in 26 hours so personally I had 18 hours of gameplay if you count around 8 hours of cut scenes.

Now I am on my seond play through in hard mode ( Big Boss hard) and skipping every cut scenes and with no continue. I am closing on 3 hours and still in Act2

You can beat the game in 4-5 hours but you need to be a real pro ( required for the hardest emblem).