This question has been answered by multiple community members. See the first response.
The chunk you named "operatingHours" is supposed to be "operatingHoursTpl", and act as the tpl to provide the HTML code for each item in the list. It is not called directly in the page, the getImageList snippet uses it internally.
<table> [[getImageList? &tvname=`operatingHours` &tpl=`operatingHoursTpl` ]] </table>
<table> <tr> <td>Saturday</td><td>10</td><td>2</td> </tr><tr> <td>Sunday</td><td>12</td><td>4</td> </tr> </table>