I understand that every fight takes it's toll on each fighter but in reality a division of 157 is only 8 fights (7 if you are one of the 99 that would have a 1st round bye in a division of 157), which over the course of an 18-20 hour day would not be that many. The hardest part would be fighting and then waiting several hours for your next warm up and fight over and over again throughout the course of such a long day.