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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.
I did a first aid course a few months back. If someone is choking and passes out you give them mouth to mouth, if you blow the obstruction into the lungs (most likely to be food) you then seek medical attention immediately even if hopefully they gain conciousness pretty quickly.