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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.
Many CFS symptoms are the same as those from hyperventilation. Buteyko suggests you test yourself with his controlled pause: Sit comfortably in an upright chair, breathe in normally and out holding your nose after the out breath. Count the seconds using a watch until you feel you have to breathe in again. The number of seconds counted gives your control pause. The ideal pause is 60 seconds, but a pause of 40-60 denotes good health. (Editor's note: 60 seconds seems too long!