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Usually yes, 21 days. But my experience with broodies is they start hatching a day early.

She doesn't have to mate with the rooster every day to lay fertile eggs. A hen can store sperm for 3 weeks. If she's truly broody, she won't be laying though - so you will want to give her fertile eggs from another hen. (or dig her eggs out of the fridge - just let them warm to room...