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How many minutes should the ultraviolet light be on when no one is working to disinfect the air in the dining room?
Over 30 minutes.

According to the Code of Food Safety Operation for Catering Services, the ultraviolet disinfection lamp is turned off after 30 minutes when no one is working, and turned on when someone is working. Therefore, when no one is working, the ultraviolet disinfection lamp should be turned on for more than 30 minutes to fully disinfect the air.

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