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People in the experiment were deemed unconcious from 1.6 seconds to almost 10 seconds after the choke began. Others were not choked out after 20 seconds. If you held the person who was unconcious after 1.6 seconds for another 8 or 9 seconds, you could cause permanent brain damage or death.
There is debate over the dangers of choke-outs. After 4 to 6 minutes of sustained cerebral anoxia, permanent brain damage will begin to occur, but the long-term effects of a controlled choke-out for less than 4 minutes (as most are applied for mere seconds and released when unconsciousness is achieved) are disputed.