My broodies were in a routine where they knew every afternoon I would take them off the nest so they could poo, eat, drink, and get a quick dust bath or whatever else they wanted to do. That gave me a chance to check the nest and remove any extra eggs that had "mysteriously" appeared there during the day. Usually they were back within 20 minutes. However, in the summer if it was really hot out (90 or so) they might be gone for an hour. My hatch rates with the broodies have all been 92 - 100% so having the eggs get a little cooled doesn't hurt them, even during the winter.
The broodies also had little bowls of food and water in the corners of the nest box so they could eat or drink without getting off the eggs. They really enjoyed having treats in there like huckleberries.
The broodies also had little bowls of food and water in the corners of the nest box so they could eat or drink without getting off the eggs. They really enjoyed having treats in there like huckleberries.