Some birds will tolerate a chicken sling or chair, while others will try to climb out of them, and can injure themselves. They are for using for shot periods of time, and they need to get out of them periodically to stretch or sleep, or for physical therapy or exercise. Hopefully they are for temporary use, but they can get a chicken ip and out of their droppings. Food and water can be placed in front of them within reach. I think you would would want to supervise being together with other flock members to determine if it is safe to be left in the sling.