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description · c01a02e83dd0daed64ac679b1e0b3a85e · Schemall
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The length of time an Observation took place over. The format follows `P[0-9]*[Y|M|D|h|m|s]`. For example, P1Y is Period 1 Year, P3M is Period 3 Months, P3h is Period 3 hours.
