ECSA here in Connecticut is thinking of doing a single handed and double handed distance race of about 30 miles.
Has anyone or does anyone here do that type of racing?
No, but I'd do it in a heartbeat. Especially if it were one-design (unlikely), and I think double-handed would be a lot of fun. We did do a few fully-crewed distance races one-design with the J about 20-25 years ago in the Annapolis area. One 60 mile overnight with thunderstorms was great. Like being on a surfboard.
There was someone who did a DH race in LIS with his daughter a couple of summers ago, but I can't find the write-up he did. I recall they did well in their division.