Need help setting up Appointments+

I just installed Appointments+ and have a few questions. I have only one person who is going to provide services, so according to the faq I didn't define a service provider

I have two services: a 10 minute consultation and a 1 hour consultation. Both are going to be provided by the same person. If someone books an appointment for a 10-minute session at 11:30 am, this means that a 1-hour session from 11:00-12:00 should not be possible.