How long does it take for a person to die after the heart stops beating?

How long does it take for a person to die after the heart stops beating?

Official declaration of death has to wait at least 30 minutes; sometimes even more. If cardiopulmonary resuscitation (CPR) is started within 4 minutes, good recovery is possible, provided the status of the heart and vital organs are good. CPR has to be supplemented by advanced cardiac life support (ACLS) within about 12 minutes. The longer the delay for return of spontaneous circulation, the lesser the chance of recovery.