Sorry, I've only just skimmed the other replies. I recently attended a one-day, beginners braiding course, and was very disappointed. Class had about 10-12 students, which I found was too many. I understand the logistics of "bums on seats" in order to make money. The number of students meant that when the teacher demonstrated anything (with normal sized lace), it was almost impossible to see. I don't know how you solve this problem if you wanted to keep the same number of students (which really isn't that many). My random thoughts are setting up a video camera/overhead projector, so that all students can see a larger version of what is happening. Or, alternatively, using over-sized lace... something such as rope, so students can clearly see what is happening. Otherwise, if you could be really organised, you could possibly stagger starting times at 15 min intervals, four students at a time, so you spend 10 mins getting each group started, then spending the last few mins checking on what the previous group has achieved.
I have also been attending a leatherwork course at an adult education college, which is taught by a remarkable saddle maker. I think a few students have dropped out because things don't move quickly enough for their liking. It is probably an unusual class in this day and age, as each student starts the term learning basic skills and one project set by the teacher, but after that, each student works on an individual project. This means that the student needs to spend time with each student individually, teaching them specific skills and coaching them through their project. Unfortunately (perhaps) this means that sometimes students need to wait to be shown their next step. I think that this puts some people off. However, students can also use this to their benefit - the teacher has no problems, and actually encourages students to "eavesdrop" on other students projects - that way you're still learning whilst waiting. I think this style class takes some getting used to, but has definite benefits in individual coaching.
Sorry to ramble - perhaps it might help?