Additionally, you are never going to find research that discussed the magical unicorns you describe and not averages. That's not how research works.
What about it? My only claim is that the answer is complicated. I'm not claiming that 60 hours/week is a magical long term answer perfect for everyone everywhere in every industry. It's the 40 hours/week people who are making that claim.
Additionally, you are never going to find research that discussed the magical unicorns you describe and not averages.
Yes, it clearly requires a wizard riding a narwhal to compute quintiles.
Without the quintiles/ventiles/etc it's impossible to conclude that an individual can't work 60+ hour weeks. That's a simple fact about distributions. If the 100+ years of research don't provide that, it simply means that more work needs to be done because we don't know the answer.