Is it normal for the front desk of billiard room to work 4500 hours a month and 12 hours a day?

Not normal. According to the "Labor Law", the state implements the working hours system that workers work no more than eight hours a day and no more than 44 hours a week on average, so it is not normal for the front desk of billiards room to work 4500 hours a month, 12 hour. Labor law is the general name of legal norms regulating labor relations and other social relations closely related to labor relations.