Cover the shift change, not the lunch hour
A round-the-clock hospitality economy means your inquiries cluster around shift changes rather than around the business day.
People call when they can. For a dealer coming off graveyard that is early morning; for someone starting swing it is late morning; for a housekeeping supervisor it is whatever gap the schedule allows. A firm answering only from nine to five is closed for a real share of the valley's working population.
Look at your own call records by hour before deciding anything. Almost every firm finds a block of missed and abandoned calls that nobody had noticed, because a missed call leaves no trace unless someone goes looking.
Then decide what coverage is worth. Extending the answered day by a couple of hours at the right end is usually cheaper and more effective than staffing overnight. What does not work is an answering service that takes a name and passes it on the next morning, because by then the caller has spoken to two other firms.
Whatever you choose, say it plainly on the website and in your ads. Availability is a claim you can actually make and check, unlike most claims in this category.