I like to let my chickens out into the run every day but it is not attached to the coop yet so once they are in, they are in. I can't always wait until they lay their eggs to let them into the run because I have to leave for the day. I noticed that on the days when I put them in the run early, they don't lay. If they are in the coop, they lay almost every day. One in particular just will not lay an egg if she is in the run too early. There is a nest box in the run with a wooden egg in it but they ignore it. So basically I guess, can a hen really just hold it in?