IllegalPaladin on 02 September 2008
About 20 hours through my first time in Solid Normal.
Playing through the same difficulty, I could do it in around 5 hours now that I know exactly where to go and what to do as well as skipping the cut-scenes.
I ran through the game for my room mate and I used stealth to get through as quickly as I can and the completion time ended up being about 12 hours. I think that 7-8 hours of cut-scenes would sound about right.
