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productReturnDays

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

Thing > Property > productReturnDays

The productReturnDays property indicates the number of days (from purchase) within which relevant product return policy is applicable.
Values expected to be one of these types
Integer
Used on these types
ProductReturnPolicy

Source

https://github.com/schemaorg/schemaorg/issues/2288