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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.
It takes 20 sec. for a person to drown. Depending on what kind of victim you are. It takes 20 to 60 sec. for a active victim to become submerged. Hear are the kinds of victims and their breathing arm and leg action, body position, and locomotion.