Your business hours will display on your Verified Venue page, so make sure they are up to date. In order to edit your normal hours of operation, click Location Hours at the bottom of the left hand toolbar:
You can click the Clear All button to remove business hours completely from your page if you prefer, but if you want to show your hours, scroll to the individual day to set them. The OPEN button next to the day can close the business for the entire day if toggled off, or use the dropdowns to choose the correct hours for that day. You can add multiple timeframes (i.e. open from 8am -12pm and then from 4pm -8pm), or choose Open 24 hours if you operate round the clock!
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: