Hi Luc - I think you misunderstood the idea of "joint sessions" here; no, I'm not working with 28 people individually for a total of 112 hours - it's literally just 4 hours, and each hour is a joint session with all 28 students. Think of a classroom where a professor teaches 100 people for an hour; is he teaching for 1 hour or 100? It's 1 hour, even though he's serving 100 students during that time. Does that make sense?

Your 28 x 4 method actually misses the point of avoiding 1-on-1 clients altogether, since taking on any individual client and giving them undivided hours would effectively be 1-on-1 and inherently time-limiting and revenue potential-capping.