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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.
At full application, somewhere between six and ten seconds will put someone out. After that, the person being choked should get up and be OK after, like, 5 to ten seconds. At full application for 60 seconds or more, a person will die. So, if you put someone out, then keep squeezing full blast for another minute, they'll be dead.