Tap to start.
Tap to stop after 20 sec.
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Select "Start" to begin each trial. Estimate a 20 second interval.
Select "Stop" to submit your estimation for 20 seconds. Your time estimation for 20 seconds will appear for each trial.
Complete three trials.
Select "Start" to begin each trial. Estimate a 20 second interval. Select "Stop" to submit your estimation for 20 seconds. Your time estimation for 20 seconds will appear for each trial. Complete three trials.
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