A broody hen will not allow the incubating eggs to cool more than a degree or two while she is off the nest. Any more than about 15 minutes and she would be in a panic to return to the nest. If she...
About 3 or 4 days - sometimes as long as 5 days
Mine started mating yesterday and I found three eggs today. I have two Golden Comet hens, two Rhode Island Red hens and one Rhode Island Red Rooster.
A hen will sit on the nest for about 18 to 21 days This is called brooding.
23 to 32 hours