Just completed the horse stall conversion to a coop and a separate run/tractor. I will be free-ranging them as often as possible, but wondered about how much run space I needed because of this. I know roughly 3 sq ft per bird in the coop and 10-15 in the run, however since my birds will be free ranged for several hours each day, I wondered, if these numbers matter as much. For reference, I have 16 chickens, the inside coop is just under 100 sq ft. and the tractor that connects to the barn stall is 32 sq ft, but I am adding another 4x8 section...so the total run space will be 64 sq ft. Do I need a larger run or will this do since they will be confined to it for only 8 hrs a day for 1 or 2 days per week?