According to Baidu Encyclopedia, according to the education dictionary, class hours refer to the time unit of teaching. The time of a class is called a class hour. In China, a class in primary and secondary schools is generally 45 minutes, and a class in colleges and universities is 50 minutes. Also known as "class hours".
The unit of measurement of education and training time related to "class hours" is "class hours". Class hours refer to the learning time calculated by class hours. It is generally believed that both non-adult education and full-time university education are 40-minute classes. Therefore, if 30 class hours of training tasks are needed, the effective training time is 30×40= 1200 minutes, 1200/60=20 hours.