Hello Gerald

I'm sorry, but I don't quite understand the question. 

I see you have quite a lot of services on the front-end, so I don't know if you're referring to a specific service, or globally? I'm not sure if you set up buffer times in your services, and how you want to handle the additional time.

For example, if your current setup allows you to create an appointment that ends at 4:45, and the working hours of the employee are until 9 PM, you should still be able to see additional time slots between these two times.

Can you please tell us which service we're supposed to look at, provide us with screenshots of how this service is configured, of your employee's working hours, etc, so we get a better picture of what exactly you need.