Gene I can not speak of the instructors course at the JKA honbu, but I do know that general classes at the honbu are only 1 hour long. With 10 minutes in between classes. I also know that the honbu dojo has air conditioning and heating, while other regular dojos in Japan do not. It has been my experience here in Japan that water breaks are given and once you reached you limit you can take a break. No one scoulds you for doing so. In the past this was different, I think. How has this affected the level of karate? I can not say for sure, my guess is that people are less willing to stoic things out, but on the other hand their technique might be better than in the past. In the end I am guessing it is a mentality thing, and level of technique is not a problem. The ideas of the past of putting up with extreme heat and very cold weather while one studied at school are slowly fading away. They are not fading away at a very fast pace, but they are decreasing nonetheless. When it comes to sports, they are being more careful. However many people who coach sports at various schools have no training as coaches. They are ex-players and that is it. Many have never taken a coaching course, first aid course, or anything to promote saftey in sports. This goes for many karate teachers here as well. Yet, when it is very hot, it seems to me many dojos will allow water breaks.