There is a lesson every forty minutes, and there is a lesson for 20 yuan. According to the inquiry of official website of Yanjing Institute of Technology, as of July 10, 2023, the class fees of Yanjing Institute of Technology teachers are calculated according to a single class, and every 40 minutes is a class and a class is 20 yuan. Yanjing Institute of Technology, located in Langfang City, Hebei Province, is a private full-time ordinary institution of higher learning approved by the Ministry of Education.