Having a set up time before a service. It would work like a clean up time, but it would be 15 mins before where you could block out a resource and give yourself time to set up for certain services. For example:
Spray Tan - needs a private room -so that resource needs to be booked out for someone to go set up in it
8:00am-8:15am- 15 min set up
8:15am-8:30am - Clients appointment time/reminder and gives them length of service from here
8:30am-8:45 - Clean up

It would work just like the clean up times after, but just having the person and other things attached blocked out before as well.