By default, these are currently set to 00:00 to 23:59, i.e. 24 hours.
You can amend by selecting the relevant day and selecting the edit button, then adding an opening and closing time.
It is possible also to have multiple times, for example if you open for separate sittings and close in between. To do this, in the relevant day, simply hit the Add button and input a further opening and closing time, ensuring they do not conflict with one another, as we have shown in the image above.