Huainan lecture is not strict, about 120 minutes. Remember to smile, bow, sign when you enter the door, then draw a topic (by the way, be sure to bring your ID card), and then you can start the class. Don't be nervous in class, don't be too fast, and look at the teacher from time to time. Bow at last. It's a matter of etiquette. I think it's better to do so.