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billingDuration

A Schema.org Property

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.
Specifies for how long this price (or price component) will be billed. Can be used, for example, to model the contractual duration of a subscription or payment plan. Type can be either a Duration or a Number (in which case the unit of measurement, for example month, is specified by the unitCode property)
Values expected to be one of these types
Duration
Number
QuantitativeValue
Used on these types
UnitPriceSpecification

Source

https://github.com/schemaorg/schemaorg/issues/2689