Count If Value Is Over Certain Amount And Another Column Contains Certain Text?

I have a worksheet where

Column D lists a service offered by a business, such as IMC, TC, Respite, etc

Column M lists how long the customer has used this service for in weeks, such as 4,5,3.5,6 etc

What I would like to do in another column is to count the number of clients who have used the service for 6 weeks or more broken down by the service type i.e. Count how many people have used IMC for 6 weeks or more.

If possible I would also like to be able to count those who have used a service for between 5.1. and 5.9 weeks too, again by service i.e. Count how many people have used IMC for between 5.1. and 5.9 weeks.