The time between induction of labor and delivery cannot be generalized, but it is specifically related to the labor force of the mother, the birth canal, the fetus and psychological factors; in general, the total duration of labor from the regular contractions to the end of labor is not more than 24 hours for primigravid women, and not more than 18 hours for transient women. 1. The force of labor is the force that forces the fetus and its appendages out of the uterus, including the force of uterine contraction and the force of contraction of the abdominal wall muscles. 2. The birth canal is the passageway through which the fetus is delivered from the mother’s body, of which the size and shape of the bony birth canal are closely related to labor. 3. The size and position of the fetus is one of the most important factors affecting the labor and deciding the degree of difficulty of labor. Generally, the position of <4kg and cephalic pre-disclosure is easy to deliver, while oversized fetus and breech pre-disclosure will increase the difficulty of normal labor. 4. Psychological factors: The psychological factors of the mother are also one of the factors affecting labor, for example, the fear of labor pain may prolong the labor process. Generally speaking, the total duration of labor should not exceed 24 hours for primigravid women and 18 hours for experienced women. If the duration is too long, it may cause post-partum hemorrhage, puerperal infection, etc., and even lead to serious consequences such as fetal asphyxia and intracranial hemorrhage. The anxiety and fear of the mother should be eliminated at the time of delivery, and the mother should be taught how to breathe and how to relax her body during delivery.