Artificial joint replacement, such as hip and knee replacement, takes about 1 hour or less, which is a minor surgery, and when the indications are met, artificial joint replacement is a very safe and effective surgery, and its operation time is related to the following factors: 1. For a mature surgeon, the length of time from slicing to loading the prosthesis is about 25-30 minutes, and the length of time to close the incision is about 15 minutes, which is related to the surgeon’s skillfulness; 2. It is related to the patient’s body type, fat and thin, and other factors.