The ruling on a teacher leaving the class before the scheduled period ends

Question:
May Allah reward you. In another question, she says: Honorable Shaykh, I work as a teacher in one of the schools. After explaining the lesson and writing the summary on the board, I leave the class and let the students write the lesson from the board. It is possible that a quarter of an hour remains until the end of the class, or perhaps a few minutes. It is also possible that a few minutes are lost at the beginning of the class before entering the room. What is the ruling on my leaving the class, even though I have explained the lesson to them in full? And does its prohibition make my monthly salary forbidden for me? Please inform us, may you be rewarded.

Answer:
It is obligatory to remain in the classroom until the end of the scheduled class period and not to leave, because the students may need you to clarify certain matters, or to explain things to them if there is time remaining, or to direct the students with beneficial guidance with which you complete the time. As for leaving before the class period is complete, it is not permissible, because this is a deficiency in the work, and what you take in exchange for this deficiency is not lawful for you. Yes.