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 Settings at the bottom of the left hand toolbar, then click Hours at the top:
You can click the Clear 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. Use the dropdowns to choose the correct hours for that day by clicking the clock icon next to each set of times. 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! To mark yourself as Closed, toggle the switch to the left of the day to the off position.
Make sure to SAVE your edits 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: