From a medical point of view, it is not premature ejaculation if you can persist for more than 3 minutes, so don't worry. The specific length of time is related to objective factors such as whether people are nervous or not, and whether kidney function is good or not. Want to extend the time, you can exercise more and eat some related health products. In addition, don't get too excited when operating, and it is also important to choose a posture that suits you.