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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.
Depends on the human. The average is about 3 minutes, after which you start risking brain damage and death. However, some people can hold their breaths for over 5 minutes. David Blaine recently set a record for about 17 minutes, but that was after hyperventilating with pure oxygen to flush the CO2 out of his system.owever, in cases of drowning, after passing unconscious, you can survive about 12 minutes (I believe) before you risk brain death. However, in certain cases, children who have fallen into very cold water have survived over an hour without air.