In my experience of running the Dopey the last five years, I've tried to PR all 4 events (5k, 10k, HM, and M). I have yet to successfully hit all 4, but come close many times (this year got 5k, 10k, HM and was off by 2 min on the M). When I do this, I find my 5k and 10k are near 100% efforts. My HM is probably about 4% slower than what my fitness would indicate. My M is about 7-10% slower than what my fitness would indicate. I dubbed it the Sextuple PR Dopey Challenge (the other two PRs are Goofy and Dopey).
@MissLiss279 actually accomplished it this past Dopey.