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A surgery spanning over a dozen hours is a tremendous burden for both doctors and nurses, but it is somewhat easier for nurses in the operating room. They don't burn out as much as the doctors do, and they can take turns to rest as there are several nurses rotating in and out.
Normally, for such an extended surgery, there should be two teams of doctors who can rotate, too. A small hospital might lack that many doctors, but this is the Tokyo University Medical School Hospital, one of the hospitals with the highest medical standards and strongest capabilities in all Japan. It should be possible to gather two full sets of surgical teams.
