It may be a silly question, but I'm worrying about my chicken. It's been sitting in the nest box and I don't know how long is normal. And when I should intervene. It is about 17/18 weeks old and has been showing signs of getting ready to lay very red comb and wattles, squatting etc. for a few weeks now. Weve noticed some changes in straw arrangement in nest boxes, so they must have been visiting. The golf ball were buried under and nest made up in a straw. Now two other chickens are outside and one sitting in the nesting box. What's up with that?