I have two arc coops I built one is 4'x8'x4' with run on bottom coop on top with 2 nest boxes and 7 foot long roost and the other is same size with coop on one side run on the other with 2 nest boxes and 7 feet of roost. Now my question is I'm gonna free range all the time except for at night to roost how many chickens can I have with these coops?