Set your Business Hours by checking the checkboxes for the days you are open.
Then, set the Start and End times for each day.
What If We Start Work at Different Times on Some Days?
Set the time for the earliest time you start. You can then create a repeating Block Out Time for the days you start later.
This also applies to days you may finish earlier. In that case, set the End Time to the latest possible time and then create a repeating Block Out Time for the days you finish earlier.