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merchantReturnDays

A Schema.org Property

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.
Specifies either a fixed return date or the number of days (from the delivery date) that a product can be returned. Used when the returnPolicyCategory property is specified as MerchantReturnFiniteReturnWindow.
Values expected to be one of these types
Date
DateTime
Integer
Used on these types
MerchantReturnPolicy
MerchantReturnPolicySeasonalOverride
Supersedes
productReturnDays

Source

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