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Storage? I am Storage!
I did one of the heart stress tests on the treadmill in the past few months and it does get ramped up really quickly. They take your blood pressure constantly throughout the test and it's very possible if the doc didn't like what they saw during the test they could end it after 60 seconds for someone in their 80s. I don't remember exactly how long I went but I don't think it was more than 8-10 minutes. My arms/wrists were getting sore with sweaty hands from holding myself at the steep incline that they get you to in a relatively short amount of time. I should also add that they never got me to a running speed. By the time the treadmill was at a pace of 4.8MPH the incline was so steep that running would have been a pain. The pace was just at an annoying speed that it was just too slow to start a jog and not fast enough to commit making it uncomfortable.
That IS their intention - they don't want you to run, that's too easy.
I just did poorly on one (less than 6 minutes, whereas on the previous one 2 years ago I managed the next two levels of incline and 12 minutes). I felt sick - I'll see what the cardio consultant makes of it on Tuesday.