Really not sure. Mt pied laid her clutch back in Jan '16 and i thought she was done with four eggs so i lifted her off the eggs but could tell right away that she still had a egg in the womb. I took the four eggs and placed her back down in the tub. In 30 minutes she pushed out the other egg. I would think the longer it takes the more problematic. Maybe other members who have more knowledge will weigh in. In the meantime why dont you contact some reputable breeders by phone. Garrick Demeyer, Corey Delong, David Green and Eric Alan.