I can't guarantee im right on this since I'm really new to the growing scene but from all my research. 35 days should be when your plants should be ready from what I have seen from a buddy who was growing your type of plants.

Here is a picture of his plants at 35 days .. it may or may not help you depending on whether or not you are growing the same strain.

http://img844.imageshack.us/img844/1...ft20mangos.jpg