Well at the introduction we can see day 14 at the top. So basically it would be at that point more or less.
I think that the game will have 21 days...
Reason? Not any reason, (it's a feeling) but the day 14 seems to be... The day... (Even tho the game with 8 days is already getting kinda lengthy, but well, screw it, the more, the merrier (・∀・))
And idk if Andeh would finish at 14 days, but for now, for sure we'll have at least those 14 days...