Hate to burst your bubble here. I called my SIL and asked her if she's ever received one of these calls.
In her 27 years of being a 911 dispatcher in a large city on the west coast, she has never once been asked a question about what their opening times were or what their hours of operation are. She knows of no one in her department who have ever been asked that question, either.
She has, however, been asked how to thaw a turkey.