We have 5 Silkie hens and a coop that is big enough for10 easily. I say this partly because although my husband made 6 laying/nesting boxes, they ALL try to cram into 1 every night. And they almost succeed! They are also in the coop only at night, they stay in the run or free-range in the yard the rest of the time. Anyway, my 16 yr old daughter wanted these chickens as her "pets". The deal is, I buy all their food and supplies, she is supposed to take total care of them and that includes of course, cleaning their coop. She is not known for her thoroughness or real cleanliness when doing a job, much to the chagrin of my husband and I. No matter how many times you tell her AND show her, she still tries to find the quickest way to do a job. I keep telling her she is going to have a rude awakening when she tries to go get a real job for which she expects to get paid! Anyway, my real question is, how often does the coop need to be entirely cleaned/scraped out and have new shavings put down? My main concern is that I don't want the chickens getting some type of respiratory illness from the ammonia from the droppings, (or whatever it is that can cause that .) It doesn't seem to be something that needs done daily, maybe because its much more spacious than they need, and its not stinky, but just wondering if theres some rule of thumb. Thanks!