How many advertisements were wasted when the hot pot buffet worked overtime for one and a half hours?

Buffet is limited to one and a half hours, and each person will be charged for more than half an hour 10 yuan, and one person will be charged for more than half an hour. Thank you for your cooperation. How many advertisements were wasted when the hot pot buffet worked overtime for one and a half hours? It can be said that the buffet is limited to one and a half hours, and more than half an hour is charged per person 10 yuan. Thank you for your cooperation. Self-help hot pot refers to the consumption form of hot pot where consumers can choose dishes at will, but the dishes they choose must generally be finished or eaten to a certain extent, otherwise they will have to add money to prevent some customers from wasting dishes excessively.