From the first time trial on 10 minute countdown 5 minutes after extra time to walk a 20 minute countdown 10 minutes. In use, when take longer to use with tablet makes children enjoy the time tester tester used maximum. Is 20 minutes. If more than 20 minutes experimenters will complain that the strain at the 2 week. Experimenters can stand and lift up the side of the leg, which gave no lead against another ข้างหนึ legs, long 10 minutes.
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