No more than 3 hours. Bamboo Ethnic School was founded in 2003, located in Zhu Jin Town, Huaxi District, covering an area of 14565 square meters. It is a nine-year compulsory school. According to the relevant regulations issued by Guizhou Education Commission, it can be seen that the class time of students taking online classes is different from that of students at school. Network teaching is a temporary arrangement to deal with the special period. In order to reduce the teaching requirements and slow down the teaching progress, online teaching adopts a half-day teaching system in principle, and the online teaching time does not exceed 4 hours and 40 minutes per class, that is, the online class hours do not exceed 3 hours per day. In 2020, the Guizhou Provincial Epidemic Prevention and Control Team announced that due to the need of epidemic prevention and control, in order to ensure children's study at home, the measures of "stopping classes and not stopping teaching" were adopted.