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Longman Dictionary of Contemporary English
business hours
noun
EXAMPLES FROM CORPUS
▪ For more information call 624-9977 during regular business hours.
▪ I thought it better to tackle him outside of business hours.
▪ Most legislators work long hours juggling lawmaking duties and outside careers, so Wren tries to limit business to business hours.
▪ My guess is you turned up on the doorstep during business hours with some papers for Marty to sign.
▪ Nine thefts were reported during business hours, police said.
▪ When the airlines refused to negotiate on the claim, the pilots refused to work outside business hours from Aug. 18.
Wiktionary
business hours

n. 1 The hours and days when a given business is available to the public. 2 The hours and days when businesses generally operate; 8:00 AM to 5:00 PM, Monday to Friday.

Wikipedia
Business hours

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.