#6 by DarthSnuggles - Mar 18 2012
I'd say it depends strongly on how driven you are to see absolutely EVERYTHING in a game. I tend to want to discover all possible paths, lines of dialogue, CGs, endings, etc., so with saving and reloading and exploring around, it took me about four or five hours on my first playthrough with Damien.
It gets a little faster when you've done the game before, since you know how some of the events play out and what you need to do to pass/fail exams, but honestly, it's worth taking your time on this game and exploring your options. There's a lot here, and the world and characters can really suck you in.