How to only view business hours in a fullCalendar agenda view

Are you asking how to hide hours outside of business hours? If so, use the minTime and maxTime options:

http://fullcalendar.io/docs/agenda/minTime/

http://fullcalendar.io/docs/agenda/maxTime/

for instance, for a 9am - 5pm calendar:

$(document).ready(function() {

    $('#calendar').fullCalendar({
        ...
        minTime: "09:00:00",
        maxTime: "17:00:00",
        ...
    });
});

Addition to minTime and maxTime setting as @scottysmalls mentioned, adding height: 'auto', will help to remove blank area at the bottom.

For FullCalendar v5, minTime and maxTime are both renamed. So, please use accordingly.

minTime is renamed to slotMinTime

maxTime is renamed to slotMaxTime

For further reference: Upgrading from FullCalendar to V5