I have one that spends half her life broody. She's broody at the moment, fourth time this year. I suppose it's handy in this freezing weather to have a "hot water bottle" for the others to cwtch up to at night and to keep the eggs from freezing. She's also broody for a heck of a long time in one go, around 6/9 weeks. When she gets broody again in the Spring I am tempted to put some eggs under her, just to see how good a mum she is.