The time of graduation thesis defense is not fixed, and the requirements of different schools, majors and defense committees are different, so the time of defense is different. Generally speaking, the defense of graduation thesis takes 20-30 minutes, depending on the specific situation. Before you reply, you should make full preparations to ensure that you have a full understanding of the research content, research methods and conclusions of the paper; Be able to express your ideas clearly; At the same time, be prepared to answer questions from the defense Committee.