A time estimation task was considered for inclusion in the Performance Evaluation Tests for Environmental Research (PETER) battery. As part of this consideration the effects of repeated testing on the reliability of time judgments, using the method of production, was studied. Forty trials per day were administered individually to each of 19 subjects for 15 consecutive weekdays. Descriptive statistics are reported and the need for knowledge about the reliability coefficient over repeated test administrations in the context of performance testing in exotic environments is discussed.
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