I just took the one at our range.
It was about 3.5 hours long in total. It consisted of the things already mentioned, including range commands, emergency procedures, club rules, etc.
At the end we all took our 22's over to the firing line and each of us took a turn acting as RSO for the others.
Then, that was it. We got a badge, but no hat!
I've actually never worked with an RSO before. We're a rural club, and in the two years i've been there, i've gone shooting many times, but only twice has there been other people there, and that was just one other guy and our club has a rule that you only need an rso with 3 or more shooters.
All that to say, i've never experienced the "range nazi" that everyone complains about.
I took the course so that i could help out new shooters. Our club's membership rules say that, after taking the club membership course, you still do not become a member until you complete 3 supervised shoots with an RSO.
When i first joined, i had a really hard time finding rso's available to do supervised shoots with me, and as a result it took a long time to complete my membership. That was frustrating. Since i live close to the range and am self-employed, i figured if i were an rso i could pop over and supervise new member shoots very easily and save them the frustration that i had.