when i first built their run it was an undulating adventure playground within 100m2 it was soon apparent that this was not enough, started off with four, not long after they had the run of the garden, quite amazing how their little scarifying legs can destroy all vegetation!! still fun to watch, especially when i come into kitchen and they all come running down for food, tapping at window now as i'm typing..
i am self employed as of last year, june, worked on golf courses all my life so not too worried about state of garden it always comes back.