When do you start counting when a broody hen's chicks are due? Is it when they start sitting in the nestbox overnight? She was sort of off and on for a week until she had gathered up quite a few eggs then started sitting in there all night and only comes out in the morning to eat and drink. I bring her drinks and a few treats during the day since it is so hot lately. So I started counting then and if that is how you're supposed to do it, I'm thinking it will be Aug 11th.... Also, will hot outdoor temps make them hatch faster?