There is not a POST Range Master class. There used to be a Range Officer class but I don't think anyone is still teaching it.
The basic Firearms Instructor class is between 40-80 hours depending on who you take it through. When I went through the 80 Sac County class about 4 years ago there were a few non-sworn in the class but they all had a good reason for being there. A couple were affiliated with a security guard training center, don't remember why the other guys were there.
Current post classes and presenters.