It certainly is an individual thing with broody & mama hens. I think that since chickens have been domesticated for so many centuries, and selectively bred for traits other than maternal instinct, hens that will go broody display varying degrees of devotion and success.
Here I've had broodies that leave their chicks at 4 weeks, and others that will hang with them until they're adults. Whenever the chicks are left alone I add them to the pen of birds eating chick starter. The girls will one day make breakfasts, the boys will make dinners.
Here I've had broodies that leave their chicks at 4 weeks, and others that will hang with them until they're adults. Whenever the chicks are left alone I add them to the pen of birds eating chick starter. The girls will one day make breakfasts, the boys will make dinners.