if duty cycle is the amount of work time in a given span. I thick the example of 100% is throwing it off... if you have a machine the is 50% Duty Cycle for 5 minutes. Every 5 minutes you can run for 2.5 minutes of the 5 minutes. Now on a machine with a 50% Duty Cycle for 10 minutes you can run for 5 minutes of the 10 minutes. So shouldnt a machine that has a 100% duty cycle be able to run for 5 minutes in a 5 minute cycle - YES so you should then be able to run that 100% duty cycle machine for 30 minutes stright with out problems. Unless they just use the 5 minute sample to test with not account for heat build up in the machine