My dentist's KPI's

So, I went to the dentist today and I arrived a couple of minutes early. Sometimes, I can't control my mind and I started thinking about how the dental practice runs.

So, if it gets scary, just move on, but I'm sitting there thinking, I see my dentist once a year for about an hour because I take pretty good care of my teeth. However, I see Nicole, my hygienist 4 times a year for about an hour each. Remember, it's weird in my head, but I start thinking, how many customers does the dentist need to keep herself and Nicole busy? If Nicole wants to work 20 hours/week for 50 weeks/year, she would need 20 x 50 = 1,000 one hour appointments. If a customer needs 4 appointments per year, Nicole needs 250 customers. Make sense?

If each of Nicole's customers need the dentist 1 hour per year like me, then the dentist will need to be available for 250 hours during the year. However, if the dentist also wants to work 1,000 hours per year, they will need 750 more customers like me and 3 more hygienists like Nicole.

Unless Nicole (or the other hygienists) wants to work more or less?

Unless customers need to see the dentist more or less?

Now, interestingly, their website shows 2 dentists and 6 hygienists. Can you do the math? I'm figuring that they have 500-1,000 customers.

Have you done your math?