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repeatFrequency

A Schema.org Property

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.
Defines the frequency at which Events will occur according to a schedule Schedule. The intervals between events should be defined as a Duration of time.
Values expected to be one of these types
Duration
Text
Used on these types
Schedule

Source

https://github.com/schemaorg/schemaorg/issues/1457