1 year shy of my doctorate here in animal behavior/ecology (left to get married) but ended up getting the masters sinstead of the PhD. Then I did a second master at the U of Rochester school of medicine in Environmental toxicology. Then I headed off to a veterarny school to work on a doctorate in equine immunotox, but the program kinda dissolved around me. That, included with personal reasons, I left, and became a teacher/training. I was basically working from 6 am to 9 pm every day, even on weekends, but it was doable. I was careful to carve out time for exercise and treatments. Being super-overly organized really helped. My health did not deteriorate during grad school DUE to grad school. But care must be taken to prioritize.