When I meet people who say - which they do all of the time - 'I must just tell you my great aunt had cancer of the elbow and the doctors gave her 10 seconds to live but last I heard she was climbing Mount Everest ' and so forth I switch off quite early.
If the heart stops for more than two minutes you have massive brain death. There are only two minutes between our conscious world and zero. That's how fragile our consciousness is.
