Have you looked at the research regarding which of those two options leads to better patient outcomes?
https://bmjopen.bmj.com/content/9/1/e024778
https://www.healthecareers.com/nurse-resources/nursing-patie...
https://journals.plos.org/plosone/article/comments?id=10.137...
It’s a mixed bag, but strongly leaning against longer shifts, in my opinion.
Could you link the studies?
This problem exist in every domain, and in medicine it can have deadly consequences. People sign up to become doctors knowing that they will have to work crazy shifts. But I guess they underestimate how the system hobbles them since it is focused on being efficient, not on achieving the best outcome for the patients.