Like rex1233 said, there are 2 chapters, approximately 2 - 5 hours of playtime.
Note to myself: I really need to add some play time counter to get feedback on how long people played :)
That's true but I won't start tracking which choices the players choose. That might be too much. The playtime on the other hand though, that's quite useful. I can do polls and ask for the popularity of girls or which important decisions was taken at point x if necessary. How would you do it on the other hand? :)