Answer: Not long at all.
Maybe it's becaues I'm on a laptop? Iunno but I've never been able to make it far.
In my opinion there should have been levels. And no I don't mean levels of difficulty. I mean like first couple levels you take care of one animal and then you get the second and finally the third. I don't think it should have been thrust upon the person that soon. It's always easier to do a game after practice yet there really was no practice time.