How long can fetal distress last is mainly related to the nature of hypoxia and the degree of hypoxia, and cannot be generalized. The normal range of fetal heart rate is 110-160 beats/min. If the fetal heart rate is continuously lower than 110 beats/min or higher than 160 beats/min, and the fetal movement is too slow or too frequent, it indicates the occurrence of fetal distress, which is generally related to abnormal placental function, umbilical cord wrapping around the neck, low amniotic fluid and other factors. In case of acute hypoxia, such as severe placental abruption, umbilical cord prolapse and uterine rupture, the fetus can die within 5-10 minutes. Once acute fetal hypoxia due to such causes is detected, the pregnancy should be terminated immediately. If it is chronic fetal hypoxia, such as gestational diabetes, hypertension, heart disease, etc., it can lead to fetal brain damage, growth restriction and other hazards, and should be treated actively. In the case of umbilical cord encirclement, the fetus may die at any time. Therefore, whether there is frequent or reduced fetal movement, or if the fetal heart rate increases or decelerates during monitoring, you should consult the obstetrics department promptly to avoid serious situations.