What is another word for hour after hour?
Pronunciation: [ˈa͡ʊ͡əɹ ˈaftəɹ ˈa͡ʊ͡ə] (IPA) 
The phrase "hour after hour" indicates a repetitive and continuous occurrence of an action or event. There are several synonyms that can be used to express this same meaning, such as "endlessly," "unceasingly," and "relentlessly." These words convey a sense of persistence and continuity, suggesting that the action being described has been going on for an extended period of time without interruption. Other possible synonyms for "hour after hour" include "incessantly," "perpetually," and "eternally," all of which convey a similar sense of ongoingness and repetition. Ultimately, the choice of synonym will depend on the specific context and desired emphasis of the writing.
