repeatFrequency

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > frequency > repeatFrequency

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
Super-properties
frequency

Source

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