I considered that... currently my flock is confined 24/7 due to AI in my county/nearby counties, but I answered for how I'd normally handle things, not for the current and hopefully temporary confinement.
Same here, I had to think about it. We're on 4 acres (with 10 birds) but more than half of it is water or bramble (or gravel/paved), so most is completely useless for foraging.