This is day 20 for my first time broody. She has been sitting through some pretty rough conditions. Temperatures as low as 13 F for two nights, highs not much above 30 at the best. Uninsulated plywood coop, heat lamp 3 feet up and just off to the side. We are so proud of her. Waiting for the sun to come out some more before look under her to see babies. We can hear little peeps!