7 to 10 days. According to the school regulations, the primary school head teacher is the organizer of class work, the director of class collective construction, the leader of the healthy growth of primary and secondary school students, and the backbone of ideological and moral education in primary and secondary schools. In order to work smoothly, primary school class teachers need to be trained for 7 to 10 days before they can take up their posts. The head teacher of a primary school is a teacher who is fully responsible for the thought, study, health and life of a class in the school.