We got our chicks on May 11 and by May 26 we built a little run for the chicks inside the 10x20 run. Hens could see the chicks and visited them all the time. It was 2 weeks and one day from the time we got them. On 6/6/19 they were in the in run with the hens but we left up the sectioned off area of the little run in case they wanted to go back to this area.