In the great teacher world, great teachers would usually have two lectures per day.
And each class had a duration of 50 minutes.
If there were too many classes, it would take too much of the students' time. What if the students wanted to attend the lectures of other great teachers? This would surely become a big problem.
The more impressive and the more famous a great teacher was, the more authority they had to schedule their own classes.
For example, Sun Mo could casually arrange his own schedule, but those low star-ranking great teachers didn't have such qualifications. Moreover, they had to pray that their schedules wouldn't clash with Sun Mo's. Otherwise, the number of students in their lecture halls would decrease greatly.
