What is Business Hours?

Legal Definition
Business hours are the hours during the day in which business is commonly conducted. Typical business hours vary widely by country. By observing common informal standards for business hours, workers may communicate with each other more easily and find a convenient divide between work life and home life.

In the United States, United Kingdom and Australia, the hours between 9 am and 5 pm (the traditional "9 to 5") are typically considered to be standard business hours, although in the United States this varies by region due to local tradition and the need to conduct business by telephone with people in other time zones. For instance, business in Chicago is often conducted between 8 am and 4:30 pm, while in New York City, business hours tend to be later—for instance, from 10 am to 6 pm. On Saturdays businesses are usually open from 8 or 9 am to noon or 1 pm.

In Mexico, the standard business hours are from 7 am to 2 pm and 4 pm to 6 pm.

In Finland, government agencies and other institutions follow the hours 8:00–16:15. Banks are usually open to 16:30. Common business is done from Monday to Friday, but major shops are usually open on Saturdays 9:00–18:00 and on Sundays 12:00–21:00, with exceptions.

Other countries have different business hour patterns. Many workers in warmer climates observe siesta during the afternoon, between the hours of 2pm and 5pm, effecting a pause in business hours, and resuming business in the evenings. La siesta is a Spanish language term, which literally translates as a short nap of 15–30 minutes.

Business hours usually occur on weekdays. However, the days of the week on which business is conducted also varies from region to region in the world.
-- Wikipedia
Legal Definition
The time of the day during which business is transacted. In respect to the time of presentment and demand of bills and notes, business hours generally range through the whole day down to the hours of rest in the evening, except when the paper is payable it a bank or by a banker. 2 Hill, N. Y. R. 835. See 3 Shepl. 67; 5 Shepl. 230.
-- Bouviers Law Dictionary
Legal Definition
Those hours of the day during which, in a given community, commercial, banking, professional, public or other kinds of business are ordinarily carried on. This phrase is declared to mean not the time during which a principal requires an employee's services, but the business hours of the community generally. Derosia v. Railroad Co., 18 Minn. 133, (Gil. 119.)
-- Black's Law Dictionary
Legal Definition
That portion of the day in which business is ordinarily transacted. See 18 Minn. 133. .
-- Ballentine's Law Dictionary