I've got a broody Australorp hen and I've decided to let her sit this bunch of eggs. However when she'd get off other hens would lay in her nest. She was laying on probably 2 dozen so I took about half from her and they're in my incubator. I checked and they are fertile but I have no clue when they'll hatch. Anyone have any idea when I should take my egg turner out? They've been in the incubator for a week now. One egg was cracked so I threw it away and it had a baby that was probably 2 1/2 inches long.