In the AM and PM (9 to 1) males and females gave estimates of the hourly passing of time for 4 hr. (N = 28). There were no differences between sexes or AM/PM estimates. The group was less than 1 min. off after an hour and 12 min. off after 4 hr. There was a wide range of individual differences. One-fourth of the Ss were within an error of 10 min. after 4 hr. whereas another one-fourth were off more than 50 min. The accuracy of estimates was about equal to accuracy of awakening from sleep to randomly chosen awakening times.
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