It only takes a a 3- or 4-day weekend to disprove this nonsense about having a longer than 24 hour day.
The first night, stay up as long as you want, then sleep in as long as you want. Do the same thing on day 2. And on day 3.
What you’ll find is something like this: Day 1, go to bed around 2 am, wake up around 10 am. Day 2, go to bed around 2 am, wake up around 10 am. Day 3, go to bed around 2 am, wake up around 10 am.
What you’ll prove is that your desired sleep hours are 2am to 10 am. And you’ll prove that you have a 24 hour cycle like the rest of humanity.
If you had a 30-hour cycle you’d experience this: Day 1, go to bed around 2 am, wake up around 10 am. Day 2, go to bed around 8 am, wake up around 4pm. Day 3, go to bed around 2 pm, wake up around 10 pm. And I’ll bet a decent pile o’ dough that you won’t have that experience.
For most people with night-owl nature the issue is one of too much artificial stimulation in the evening, leading to a very slow and late wind-down at the end of their day. “Late” only in the sense of leaving too little time before their artificially imposed wake up time.
This can be trained out of the majority of sufferers.
The other approach is simply to accept that you’re happiest when you sleep from 2am to 10am, and rework the rest of your life to match. It isn’t easy, but neither is struggling to live and work a schedule fundamentally ill-suited to your physiology. Doing that is taking years off your life.
Good luck whichever you do.