Legal analysis: the daily working hours of underground workers (including the round-trip time from wellhead to work place, etc. ) shall not exceed 8 hours, and the working hours shall not exceed 40 hours per week. Indeed, due to the needs of production and operation, the working hours can be extended after consultation with trade unions and employees, generally not exceeding 1 hour per day; If it is necessary to extend the working hours for special reasons, the working hours shall not exceed 3 hours per day and 36 hours per month under the condition of ensuring the health of employees. Coal mining enterprises that arrange underground workers to extend their working hours shall arrange compensatory time off or pay overtime wages according to law.

Legal basis: Article 3 of the Labor Law of People's Republic of China (PRC) stipulates that workers enjoy the rights of equal employment and occupation selection, remuneration, rest and vacation, occupational safety and health protection, vocational skills training, social insurance and welfare, submission of labor dispute settlement and other labor rights stipulated by law. Laborers should complete labor tasks, improve their professional skills, implement labor safety and health laws and regulations, and observe labor discipline and professional ethics.