We weigh, we measure, we listen, we offer advice. We do an initial half hour ish introduction to the diet and how to use it, a health screening etc. We follow up in the first week to check everything is OK. We offer support and advice and regular weigh ins throughout the weeks of weightloss and maintenance.
Business wise we all work a bit differently, some work in groups, some individually, some deliver, I think most don't. Most work from home although some hire halls.
How long someone spends with their CDC is really dependent on the individual. Some people want to stay and talk about non and diet related things, others just want to get weighed get their stuff and go.