I have a sub-2 HM, but it's not fast enough to qualify for S2 for the marathon, for example.
This is a common question, so we'll cover someone's time that's in the middle using these tables.
A runner has a 1:58:00 HM time that is POT submittable.
-If they run the HM as a solo event and submit the 1:58 HM time, then they will be assigned s1. That is because the HM time is less than 2 hours. See bottom table.
-If they run the M as a solo event and submit the 1:58 HM time, then they will be assigned s3 for the M. That is because the HM time is between 1:53:46-2:07:48 which is the estimated bucket for s3.
-If they run Dopey and submit the 1:58 HM time, then they will be assigned s3 for the HM and M. That is because the HM time is between 1:53:46-2:07:48 which is the estimated bucket for s3. In some years, the 1:58 HM POT would mean a s3 for the 5k/10k, and in other years they've assigned you based on the 5k/10k estimated pace submission at registration (editable up to the POT deadline).
So if you're running either the M/Goofy/Dopey, then you look at the top table. If you're running the HM as a solo event (or a HM Challenge weekend that doesn't include a M), then you look at the bottom table.
ETA - Added some additional clarifying language.
however, everyone that I knew who was doing Dopey received the same start group for both bibs. For example, my proof of time correctly put me in the s2 group for half/full, and my 5k/10k bib also was in s2, but based on my pace selection on the 5k/10k (less than 8 minute pace), I should have been in s1 for those races. My daughter, who was only running the 5k and 10k (and also selected "less than 8 minute pace") was put in s1 for each of those races.
This was a key change in 2022 vs prior Dopey years that had the "estimated pace" at registration for the 5k/10k. In year's past, the 5k/10k assignment was driven by your choice of "estimated pace". But based on the data, it seems like that was largely ignored in 2022. If you were a s2 for HM/M based on POT submission, then you were a s2 for 5k/10k despite putting "sub-8" as your estimated pace. I don't particularly like this change. This is like the early years of Dopey where there was no 5k/10k estimated pace submission for Dopey runners and their assignment was purely driven by their POT. I hope they go back to like it was in the middle years.