A class lasts 40 to 50 minutes an hour, mostly 45 minutes. In social organizations, each class hour is one to two hours, and class hour refers to the time unit of continuous teaching, that is, 1 class hour is the time occupied by a class.

Class hours generally refer to class hours. Usually, the class hours of non-adult education and full-time university education are 40 minutes.

Moreover, the current university courses are all based on class hours for academic progress, and the class hours of adult education are also different according to the characteristics of the industry.