They're 18-20 weeks, not laying yet and are healthy. I've had them since they were 7 weeks old. I started letting them out at 8 weeks so it's not like this is their first week. I leave the run open all day. They go out for about 10-30 minutes in the morning. During the day, they're all laying in the run underneath the coop even in this nice cool weather we're having. In the evening they'll go back out for about an hour. What the heck? They've got plenty of cover. I hear about people who's chickens will be out all day. What's the deal with mine?