Ah on the 30 hour day: I had some success living a 28 hour day for a few months, which has the nice property of meaning your awake hours are identical week to week making it at least somewhat possible to interface with polite circadian society.

6x 28 hour days pack cleanly into a 7-day week, so all Mondays you wake at the same time, then all Tuesdays you wake 4 hours later and so on. It was one of the most productive times of my life but ultimately left my partner feeling unhappy and lonely.

Fuck it we do our best with 24 hour days…

Your comment prompted the epiphany that I am a natural 4-cycle per 5-day person.

That's enough synchronization that I am going to give some thought to what the crossovers times with "normals" will be, and may try it.

Synchronizing across M-F, then adjusting between Friday evening and Monday morning, to repeat.