How long will your labor take? As delivery approaches, many pregnant mothers become more nervous, and the uncertainty caused by the unpredictability of delivery time makes pregnant mothers worried. Although modern medicine cannot accurately tell the specific time of delivery, it can still roughly determine the length of delivery based on factors such as the pregnant mother\’s size, age, physical condition, etc. Mothers can feel at ease knowing the approximate time. Is labor long or short? Doctor\’s Order Delivery Time Pelvic Size The pelvis is the only way for the fetus to pass. The pelvis is divided into upper and lower parts. The upper part is wider and the lower part is directly related to childbirth.