1. When is the library open?

It is open from 8 a.m. to 5 p.m.

2. What time is the library open?
It is open from 8 a.m. to 5 p.m.

3. What are the opening hours of the library?
The opening hours are from 8 a.m. to 5 p.m.

4. What are opening hours of the library?
Opening hours are from 8 a.m. to 5 p.m.

5. What are the opening hours of the library?

It opens at 8 a.m. and closes at 5 p.m.

(Would you check the questions and the answers? Are they all grammatical? Which ones are common expressions?)

1 answer

Most of these are right, except I wouldn't use #4.

See your other post below for specifics.