The phrase "official hours" is correct and usable in written English.
It refers to the designated or established working hours of an organization or institution. Example: "The office is open during official hours from 9 AM to 5 PM, Monday to Friday."
Because everything there is free, the store has no official hours and it is never locked.
Official hours (though these are subject to change) are Sun to Thurs 7.30am 11am, 1.30pm 3pm.
They carefully compared the official hours series with one they constructed from surveys of employees.
There are no gates, but the park's official hours are 6 a.m. to midnight.
FHFA's official hours of business are 8 00 a.m.-5 p.m. (Eastern Time), Monday through Friday, excluding Federal holidays.
ISLAMABAD, Pakistan — At least seven people were killed late Friday when an American drone fired three missiles at a house in northwestern Pakistan, according to an intelligence official, hours after the country's new prime minister announced his cabinet.
The cafe winds down to a natural end after its official hour, but many linger, deep in conversation.
After all the drama, Wardell's official hour – holding before her large green sign promoting the charity Childline – seemed rather tame.
Neither team had scored during the first leg in Málaga, but when the official hour and a half was over in Dortmund's cavernous stadium, there was a gathering despair, a desperation, among the vast majority of the 65,000 fans.
Sobbing, she told school officials that her son's father had been detained by immigration officials hours earlier.
The flight data announced by the North roughly matched that released by Japanese and South Korean officials hours after the launch.
