The onset of pain every 3-5 minutes indicates a regular contraction, which takes about 9 hours for a woman in labor and about 14 hours for a woman in her first trimester to deliver the baby, although the exact time may vary. The onset of labor is defined as the onset of labor when the labor pains occur every 3-5 minutes and last for more than 30 seconds. The total stage of labor is the entire process of labor, starting from regular contractions until the delivery of the fetus and placenta. The first stage of labor is the period of cervical dilation, which takes 6-8 hours for menstruating mothers and 11-12 hours for primiparous mothers. After the opening of the uterus, the second stage of labor, i.e. the delivery of the fetus, takes a few minutes or an hour for a woman in labor and 1-2 hours for a woman in labor. Due to the different size and position of the fetus, the exact time of delivery may vary individually. Therefore, if a woman has regular contractions, it is recommended to go to the hospital in time for delivery.