A five minute response time may not be realistic for your small business unless you are glued to your computer, have dedicated staff or offsite administrator who can monitor activity. So, what can you do to make sure your business isn't negatively affected?
First, you must have Messages turned on in your settings so that customers can contact you directly. Make sure that you turn on notifications for messages in your settings. There are settings which can help set some expectations from consumers and not draw the wrath of Facebook.
1. Set an away message if your business is closed. You must list your business hours for this setting to work.