how do I create 30-min appointment at 1:45?

I installed appointments+ and it's working. I offer 30-, 45-, and 60-minute services. When I set a break ending at 1:45, it shows 1:30 as AVAILABLE when I have the 30- or 60- minute service selected on the front end. It shows 1:45 available when I have the 45-minute service available (correct). Is there a way to schedule 30- and 60-minute appointments at the 0:15 or 0:45 time slot?