How long it takes for a pregnant woman’s water to break to go into labor is related to her personal constitution and whether her water breaks normally or her membranes break prematurely. Normal labor is when the water breaks during the period when the mother’s uterine opening is wide, or when the uterine opening is wide enough to allow the fetus to enter the birth canal, and its an important precursor to labor. Premature rupture of membranes, on the other hand, is a rupture of membranes that occurs just before labor. In some pregnant women, premature rupture of membranes is followed by the release of endogenous prostaglandins and contractions, which will soon cause spontaneous uterine contractions and the onset of labor when the uterine contractions are regular and the opening of the uterus begins to dilate, which also indicates that labor will soon take place. However, some pregnant women do not experience regular contractions after premature rupture of membranes and need to be induced with oxytocin in order to give birth, in which case it will take longer for the pregnant woman to give birth. In any case, it is important to go to the obstetrics and gynecology department of the hospital in time after the water breaks during the late pregnancy and be treated promptly.