happy hourhappy hour
(plural happy hours)
In normal English usage, the term happy hour is used to refer to the daily period of reduced prices, regardless of its length. The plural is only used to refer to the happy hours at different establishments (e.g., which bars in town have the cheapest happy hours?). The practice, common in some languages (notably French), of pluralizing the borrowed expression in reference to a period longer than one hour (e.g., happy hours de 16h à 18h) is unidiomatic in English.