My recommendation is to not do one unless you have some particular problem that concerns you or a doc you respect. Too many live changing false positives. Plus, it is only a picture of you on that day. Not very predictive.
In my case, my PCP, thought it might be "fun" to see how I did on one and the needed someone to help in training. When I did it I was, by memory, somewhere around 13 minutes when I had a few abnormal beats. The cardiologist who was doing his residency. Went bonkers. Was admitted to the hospital and the next day had an angiogram and an ultrasound. Both of which were normal.
But, according to protocol I had a cardiac problem. So, on to medication I went. Or, so he thought. I did not take the medicine. The repeat a bit later was unremarkable and I did the whole protocol. This was some 30 years ago.
Lots of people with similar experiences.