Mine do seem to enjoy some room to boogie. They (currently nine, but I sized for 12) have a 10'x16' day pen where I can lock them up when I am away (fence top sides and bottom). The pen has a swim pan, a loafing area with straw for napping, and compost for them to forage in. It's attached to their house and veranda, where they spend the night. That's another 64 sf.
When I'm nearby, they can roam around another 400 sf or so. We also go for walks in the back yard and I let them noodle around in the 1800 sf forest garden while I work down there.
So, they aren't free range as in, wander all over a few acres, but they aren't cooped up all day, either.
Just wanted to share an idea of what not free ranging can look like. There are thousands of possibilities.