The spelling of the word "hhours" may seem odd at first glance, but it is actually a clever way to denote a longer duration than "hours." The double "h" represents a prolonged sound, similar to the way we pronounce the "o" in "moon." In IPA phonetic transcription, it would be written as /hɑʊərz/. This unique spelling is often used in businesses or events that span multiple days, and it helps to distinguish from the standard 24-hour cycle of a single day.
There doesn't appear to be a word "hhours" in the English language. It is possible that it is a typographical error or a misspelling. If you are referring to the word "hours", its etymology can be traced back to the Old French word "hore" or "heure", which came from the Latin word "hora". This Latin word ultimately originated from the Ancient Greek word "hṓrā", meaning "time" or "season".