There’s sometimes like 15 layers of stuff between what surgeons are getting at and their tools, so it takes a lot of time to carefully move a lot of things to the side and stich them all back up appropriately. Sometimes they have to mechanically file away at things, carefully screw things into bones without cracking them, or carefully saw through bones to do what they need to. There’s also a lot of prep work, labs, anesthesiology that all takes time. Sometimes they have to reconnect blood vessels too.
Think how long it takes to assemble an ikea desk, but if you make a single wrong move someone dies, and it’s like 30 times more finnicky, and you also have to disasseble it when you’re done
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