Two hours. According to official website, Changzhou Mingsi Education, due to the large number of students, the course time is set to 2 hours per class, with 50 students per class, and other classes are charged by 240 yuan. Mingsi Education is an educational institution specializing in extracurricular tutoring for primary and secondary school students. With a scientific education system, excellent teachers and management team, it has developed from educational software development and "one-to-many" counseling to "one-to-one" personalized counseling for excellent teachers.