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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.
Rating Newest Oldest. Best Answer: After a few minutes, around 3 or 4, a person holding their breath will fall unconscious. The body will start breathing again automatically after that and the person should come to. You really shouldn't ever hold your breath to this point, but that's what happens, for your information. And also, doing it in water for prolonged periods of time is a TERRIBLE idea.