Actually we've seen Sasuke being stabbed by Shin's weapons which rendered his movements dull all around his back, and then he pulled them out himself and started walking a few seconds afterwards, and when Sakura was attacked by the same very weapons, she some movement in her arm despite Sasuke saving her in the process (having to hold it for the entirety of the last few chapters until they reached home). Not to mention there was actual blood coming from Sasuke's wound when he was stabbed by the knifes, and after he pulled them out it didn't see to bother him anymore.
I think that implies he has some sort of accelerated healing, not that surprising considering the fact that they are Demi-Gods, and he has Hashirama Cells in his body. Sasuke has shown being capable of not only matching RSM Naruto in speed, but also capable of fighting on the same level of physical power (but obviously Naruto has different ways to improve his whether it be Bijuu chakra from the 5 tails, or mimicking Sakura's CES via the Last example).
Clearly Sasuke's body isn't human. Especially given what Kinshiki has shown with his raw power, and Sasuke too. I can't really agree with the notion that Sasuke wouldn't survive enough blows to his body and he wouldn't make it. Clearly Sakura loses in every category until she activates that Seal on her forehead, and even then she wouldn't last a second with Kinshiki in a match.