We ferreted rabbits a few years back for 2 different areas we let of 30 the first day into an old burrow and and then probably another 20 over the next week or 2. This was early March just coming close to breeding time. I might aswell have fed the dogs with them not one to be seen around the place after 3 weeks of us letting them of and still none there now that was 7/8 years ago.