According to Article 36 of the Labor Law and the State Council's Regulations on Working Hours of Employees, China implements a working hour system in which workers work no more than 8 hours a day and 40 hours a week on average, that is, a standard working hour system.

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Those who exceed this working time limit or arrange work on rest days or legal holidays constitute overtime. Enterprises that cannot implement the standard working hours system can implement the comprehensive calculation working hours system and the irregular working hours system with the approval of the human and social departments according to law, but they must also guarantee the workers' right to rest.

In this case, the hotel did not implement the special working hours system without approval, and arranged work according to "two days off every month, 9 am to 9 pm", which obviously constituted overtime.