The maximum number of days that a premature rupture of membranes can last needs to be analyzed according to the pregnant woman’s own situation. Premature rupture of membranes refers to the natural rupture of membranes before labor. The treatment of premature rupture of membranes varies from week to week, and there is no such thing as a maximum number of days. If the membranes rupture at full term, labor should be induced within 2-12 hours, and antibiotics should be used to prevent infection for more than 12 hours after rupture. For premature rupture of membranes in the second trimester, termination of pregnancy is recommended at <24 weeks, 24-28 weeks according to the local capacity to treat the newborn and the wishes of the family, 28-34 weeks under close monitoring and fertility preservation, and termination of pregnancy is recommended at >34 weeks. It is recommended that patients with preterm rupture of membranes should be hospitalized in time, pay attention to check the amniotic fluid, and follow the doctor’s instructions.