Set specific times for a specific date

I have just been testing out the appointments plugin and I have noticed that is possible to set exceptional working days but are you also able to set a time with this? I want to be able to set it up so I might only select 4 days a month which provide services and the start times of those services will be completely random to one another. For example, on the 7th I want starting times at 8:00am and then on the 12th for the same service it will start 10:00am and 2:00pm. I hope that makes sense.