I was out in Naples for 3 and a bit weeks in Oct 99 , & I have got to say having got to know the instructors reasonably well during this time ,they never complained & did nothing but praise NAC.
I felt they did work long hours but it did'nt seem to bother them nor did they seem stressed at all.
Maybe it suits everyone concerned , Business does well , satisfied customers & Instructor gets his hours in.
I can't complain.