Surviving hanging

Hi! So I was writing a story in which one of the characters is hanged and rescued. The idea is that they lose consciousness while hanging. When the rope is cut, would they regain consciousness immediately, or would they need help to start breathing again? And once they regain their breath, would they be able to walk and talk?

I guess it depends on how long they've been unconscious, but could someone tell me what happens depending on the time they've been out? I've googled it but can't find any information (maybe I don't know how to search for it, haha).

Thanks a lot!