Labor from three to ten fingers takes about four hours, up to a maximum of eight hours for a primigravida; it is faster for a menstruating woman, usually taking two to three hours, up to a maximum of four hours. There are three stages of labor, the first, the second and the third. The first stage of labor is the stage from regular contractions to full opening of the uterus, which generally takes 11 to 12 hours for primiparous women, and should not exceed 24 hours at most. The stage from regular contractions to three fingers of cervical dilatation is called the latent period, which usually takes 8 hours and should not exceed 16 hours at most, while the stage from three fingers of cervical dilatation to ten fingers of full opening is called the active period, which usually takes 4 hours and should not exceed 8 hours at most. In contrast, the first stage of labor is more rapid in menstruating women than in primiparous women, and generally takes 6 to 8 hours. The latency period is about 4 to 6 hours; while the active period from the opening of three fingers to ten fingers usually takes 2 to 3 hours and should not exceed 4 hours at most. The second stage of labor is the stage from the full opening of the uterus to the delivery of the fetus, which generally takes 1~2 hours for primiparous women and should not exceed 2 hours in general; and the fetus can be delivered in a few minutes for experienced women, and should not exceed 1 hour in general. The third stage of labor is the delivery of the placenta, which usually takes 5~15 minutes and should not exceed 30 minutes. If you have any other questions, it is recommended that you consult a medical professional for guidance.