Surely it's not an endurance test? Isn't the time you spend on the machine the time necessary to achieve and attain certain measurements. Isn't it also true to say that the fitter you are, the longer you'll have to spend putting one leg in front of the other?
There are those here that know.
As for me, well, I'm older than 71 and my EASA/UK Class 1 has just lapsed. I usually begin to get a tiny bit laboured at 9 minutes. Oh yes, I do Pilates once a week, that's it on the exercise stakes and I've had four different kinds of cancer so I guess that means, as I wave goodbye, that I'm the biggest penis on the block?