The term "normal hour" could be substituted with several synonyms that convey a similar meaning. Some of the alternatives include "regular hour", "standard hour", "typical hour", "conventional hour", "average hour" or "everyday hour". Each of these phrases indicates a standard or expected period of time when a certain activity occurs or when a business is open. For instance, a "normal" or "regular" hour at a restaurant could be during lunch or dinner time, whereas an "everyday" hour could be the typical 9-5 workday. Whatever phrase is used, it should be clear and easily understood by others.