I let most of mine out when I get home from work, but about 8 or 9 let themselves out daily by flying over the 4' chainlink fence that makes up their pen. The 2 male guineas will fly out, but the females stay in until I open the gate. The ones who let themselves out daily have about an acre they roam, open field and nearby woods, but seem content to avoid the road. The guineas, however head for it like a bullet out of a gun as soon as I open the gate! 8 acres to roam, but they have to go across into my neighbor's yard! She does not mind at all, but it worries me because cars fly up and down my road, and I know I'm going to lose one sooner or later. The benefits from the bug-eating, though are apparent, because my dogs and cats rarely get ticks, where my neighbors' are getting eaten alive this year! I would let them out full-time if I were at home, and I do when I'm there, but have had dog problems in the past. HTH, Janet