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observationPeriod

A Schema.org Property

This term is in the "new" area - implementation feedback and adoption from applications and websites can help improve our definitions.
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.

Values expected to be one of these types

Used on these types

Source

https://github.com/schemaorg/schemaorg/issues/2564