When the uterine opening is 2cm wide after labor, it takes 12-20 hours for labor to progress smoothly. When the uterine opening is 2cm wide, it is only in the first stage of labor. If the contractions are good, there is no cephalopelvic asymmetry, the fetus is small, the birth canal is usually smooth, and the fetal heartbeat is normal, the woman will be able to have a normal delivery in about 12 hours. In the case of primigravida, the delivery time will be prolonged, and if there is any fetal distress such as slow descent of the fetal head, rapid or slow fetal heart rate, etc., which cannot be relieved in time after appropriate symptomatic treatment, a cesarean section may be required to terminate the pregnancy. Relying solely on the opening of the uterus by 2cm to determine how long the delivery will take depends on the specific circumstances of the case, resulting in the normal delivery of the fetus and the size of the pelvis, the degree of descent of the head of the fetus, as well as the size of the fetus, the force of delivery, fetal heartbeat, and other aspects of the situation are very much related to the situation.