opening hours / open hours

[optimistic pessimist]

When you refer to the operating hours of a facility, which do you think is more commonly used?
An American friend of mine says "open hours" is more correct than "opening hours" because the latter may sound like the time(s) when a facility opens and starts operating.
However, I have found several examples of "opening hours" used to refer to the time range of operations. The following is from the website of the British Museum.

Our opening hours are daily, 10.00–17.00 ( Fridays: 20.30)
Last entry: 16.00 (Fridays: 19.30)

Do you agree with my friend?

 

[probus]

I disagree with your friend. I'd have said that "open hours" is rarely if ever used in AmE. In my region we typically use "opening hours" or "hours of business".

 

[emsr2d2]

I disagree with your friend too. To refer to the time that a business opens its doors and starts operating, I'd use "opening time". In BrE, "opening hours" always refers to the daily times of business, and would be followed by the opening time and closing time each day.

 

[Tarheel]

The phrase I'm used to is ”hours of operation.". However, I'd probably ask (if I had to) "When do you open?" or "When do you close?"