Certainly a valid point.....and one I hadn't considered. Thank You for raising it. My thoughts have always been more about physical issues like hydration, hygiene, nutrition, insuring adequate circulation, maintaining safe airway/ breathing etc. etc.

Do you think knowing there was a definite end point and approximately how far off it was might help avoid that kind of effect? Would you always be in that intense mental zone even if there were "Semi" breaks (left in relatively light and comfortable bondage or locked in a cage that allowed you to stretch out)?