2 miles for the test. I ran the first mile and it was looking fine and then my pace dropped way off and by the end of mile 2 I had what I needed. There was a significant drop off in pace (1:29) which shows that I have very poor "endurance". No surprise. I could have easily ended the test at 1.25 miles (hell, I didn't even need a test to tell me that) and gotten what I needed. Even just a few miles stressed my body enough that my heart was working harder. I could have continued the test but why? To see even more shitty data? There was no need because continuing wouldn't have revealed any more useful information and also because I now have plenty of comparable data for a future test and that was really the only point of doing it. Stretching the test further would have revealed that I'm in terrible shape and my endurance sucks... duh.
Another idea is that when I do test again and if my warm-up is correct and my first mile (or even first half mile) yields a slower pace than today's test I see little reason at all to continue. I'll stop the test immediately because I already know that the result won't be better. If I continue the test nothing in the HR data will reveal any answers or solutions or even what the problem is as the miles go on.
That's all I have to say about that. For now.