I'm not sure how much longer to leave my Platy in the breeding trap, can anyone help?

I have her in a breeding trap now so she can't eat the babies, but I don't want to keep her in it for too long. I just want to know how much longer people think she has until she has them. http://i99.photobucket.com/albums/l308/underworld_princess_08/0001.jpg thats a URL to see a picture of her in the breeding tank.