My neighbor complained that the chickens are tearing up her landscaping so now I need to keep my free range birds cooped up. I'm planning on building a run for them. How long will it take for 13 chickens to kill the grass in an area 10 x 15? Will this confinment affect their egg laying? THey have a coop they go into at night so we are adding the run onto that. It's a bummer because I just ordered 10 more chicks too. We are giving away 5 Red Starts to reduce the flock and they chicks won't be ready to move into the coop for awhile anyway. I feel really bad for them having to be cooped now!