Depending on the route, either 1 or 2 days. The developer got hit with a nasty typhoon which made him lose his electricity and his roof so that's why there aren't any updates for a while now, just in case you were wondering. He's starting development again though, from what I've seen.
Your route is determined pretty quickly actually.
SPOILER WARNING! IF YOU WANT TO FIGURE IT OUT ON YOUR OWN, DO NOT CONTINUE READING THIS POST!
Shortly after the story starts, you'll make your way to the auditorium, where you're presented with a choice, asking you which way it is. Left or right.
'Left' ends up being the incorrect way, and you are then presented with two further choices:
'Head back' leads to you turning around and making your way to the auditorium, setting you on Rask's path.
'Keep going' leads to following the path until you panic and are then found by Maccon, setting you on his path.
If you , instead, went 'Right' with the first decision, you make your way to the auditorium, and are met with your friend, John, who has offered you a place between him and his brother, Tom. He makes you an offer to switch seats when awkwardness arises over your past.
Saying 'Yes' puts you on John's path, with him clearly not happy about you taking the offer to switch.
Saying 'No' puts you on Tom's path, which begins with an 'awkward' conversation.
Hope that helps!