Our house sits on about 1 acre of mowed "yard" (there are 4 more acres that just grow wild atm) and there is a small wooded area right next to our house. My chickens are 6/7 weeks old and they go all over the place. They have explored 3/4 of the yard and all of the woods. The woods is their favorite part. We don't leave them out if we are leaving, but otherwise they have free run all day long. When I first started letting them out I was paranoid, so I sat with them all day and they stayed really close. Gradually they started exploring further and further, and I think they are now going as far as they ever will. Thankfully they don't go to the part of the yard that my garden will be in. lol When they first started going into the woods I was worried they would get lost and wander into the neighbor's cow pasture, but every so often they pop out into the grass and then go back in. lol When one or two get separated, they call to each other until they are reunited. They always come back at night. They don't have a coop yet, but when they are ready to be put away they huddle by their brooder so we can put them in it.