What are their business hours?

他们的营业时间是什么时候？

What are your business hours on Sunday?

星期天你们营业时间是几点到几点？

Customer: What are your business hours?

顾客：你们的营业时间是什么时候？

Normal business hours are between 9 am and 5 PM.

正常营业时间是上午9点到下午5点。

What do you think of the business hours at present?

您认为我店营业时间是否合适？