Why do surgeries, especially transplants, take so long?

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I just saw a post about a doctor monitoring his patients vitals after a 23 hour long heart transplant surgery, with the nurses sleeping in the background. I understand that that may be one of the hardest things in the world to do, and requires an amount of focus I can’t even imagine. But still, what takes **so** long in the operation room?

Ninja edit: missspell

In: Biology