How long did a normal young man die when his breathing and heartbeat stopped?

The main problem of respiratory cardiac arrest is that the brain will die because of lack of oxygen. After the brain dies, even if the technology makes the heart jump, people still die.

Brain cells began to die after the heart stopped supplying oxygen for 3-4 minutes, and were basically hopeless after 10- 15 minutes. But there are also some special cases, which can survive after one hour at extremely low temperature. Of course, that's just a special case.