Mine are kept in a large enclosed run 24/7. We have way too many daytime predators like coyotes, peoples loose dogs, hawks, eagles, etc. My run is 1,400 sq ft for 12 chickens (20 in spring). It’s 6ft tall and has 1/2” 19g hardware cloth on the sides and 1” 16g hardware cloth on the top. Pretty much 100% predator proof for all that we have around here (we don’t have mink or small weasels in Southern California. Supposedly we have a largest long tailed one. Coop is shut at night either way though.) People around here have lost chickens to coyotes (and of course hawks as they nest here) even with an electric fence set up so I just opted for a fully enclosed hardware cloth run.