In order to edit your normal hours of operation, click Location Hours on the bottom of the left hand toolbar:
These will display on your Untappd Venue Page, so make sure they are up to date.
You can also remove the hours from being visible on your page by clicking CLEAR ALL in the top right corner:
Make sure to SAVE your edits at the bottom of the page when you are finished:
This is how they appear on your page on Untappd on a desktop browser:
On the mobile version of Untappd, they will appear under the DETAILS section of your page: