I have 4 black star hens and it appears that one may not be laying eggs. Once a hen enters the nest box, about how long does it take her to lay the egg and get out of the nest box? I have been watching the hens to pinpoint which one is laying which egg. I'm trying to gather the eggs shortly after they are laid so I can tell if one of them is not laying and maybe has a problem. Or maybe I have an egg eater? Thanks for your help.