Scheduling 60 Min Appts with 15 Min Gap In Between?

What is the best way to do this?

I suppose I could set the appointment booking length to 75 minutes to accomplish the same thing, but then it would display that the appointment lasts approx. 75 minutes instead of 60 minutes.

In the alternate, is there a simple way to override the appointment length displayed on the appointment confirmation page to show that the appointment lasts approx. 60 minutes instead of 75 minutes?

Thanks much in advance for your assistance.

JC