billingDuration - Schema.org Property
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A Schema.org Property
This term is in the "new" area - implementation feedback and adoption from applications and websites can help improve our definitions.
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).
Source
https://github.com/schemaorg/schemaorg/issues/2689