For how long does the brain remain alive after the heart stops trouncing?

After the heart stops beating, due to heart attack or other condition, the brain remains alive. That is why inhabitants who are revived soon enough arent not here brain dead or brain worn out. My question is how long after cardiac arrest does the brain shut down? 10 points for the most accurate and documented answer. Thanx
During hypoxia, a partial loss of oxygen from the bloodstream, or Anoxia, total loss of oxygen, the brain can survive an average of 4 min to 6 mins. Any longer than that and brain cell start to drop like flies.
5 to 6 minutes , usually

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