How long it takes for the cervical canal to subside by 50% to give birth cannot be determined, and it can take from hours to tens of hours, to days, or even require a cesarean section. There are many reasons that affect the duration of labor, such as the number of deliveries, the size of the fetus, the condition of the mother’s pelvis, and the contractions of the uterus. 1. The time of labor can be significantly shorter for experienced mothers than for primigravid women due to previous dilatation of the uterine opening. 2. During labor, if the fetus is too big or the mother’s pelvis is relatively small, cephalopelvic disproportion may occur, thus prolonging the time of labor, or even requiring cesarean section to terminate the pregnancy. 3. Poor contractions may occur during labor, leading to prolonged labor and prolonged delivery time. The use of artificial rupture of membranes and the use of uterotonin can strengthen the contractions and accelerate the progress of labor. During labor, there are many factors affecting the duration of labor. If the patient enters the labor process, she needs to closely monitor the fetal heartbeat and follow the doctor’s instructions for checkups and treatments, so as to avoid rapid labor or stagnation of the labor process.