I opened the door to the world to my 8 week old chicks today. I moved them from the brooder to the coop a week or so ago. I kept the closed for a few days for them to learn where home is. Well, I went out to check on them an hour after dark and found them in the far corner of the run huddled up. I guess I will keep them in lock down a little longer. How long should it take for them to understand that they are supposed to go inside the coop at night?