There is no specific time limit, but the project will generally be completed as soon as possible within 12 months after the completion of the doctoral program. In the mid-term, an examination will be conducted within 24 months after the doctoral entrance, and the defense is generally within 15 to half an hour. The requirements of each school are different, depending on how your research group is organized internally, because this is not an external examination, but an internal examination in your own laboratory. The mid-term defense report contains more contents, and the specific situation is analyzed. The mid-term defense is usually in the middle of the postgraduate stage, and its purpose is to check and evaluate your existing achievements and progress, and whether you can continue your studies. Therefore, when reporting, you need to report your situation comprehensively. Usually published papers, topics attended, courses attended, books read, conferences attended, etc. Can be elaborated. What exactly do you need to report? It also depends on the regulations of your college.