Time of

I thought of just creating a new thread for the problems and confusion regarding time. I will bookmark this as a preservation method so that when I need any help I can open and read it will help me to learn.

Can I ask like these, I mean I can but would my sentences be grammatically correct?

What is the time of English classes for class 5?

What is the new time you set for class 5 English classes?

At what time the English classes are scheduled for class 5?

What time the English classes are scheduled at? For class 5.

Please help me to clear my confusions here? Thank you.