The typical delay the order has been sent for delivery and the goods reach the final customer.
In the context of [ShippingDeliveryTime](https://schema.org/ShippingDeliveryTime), use the [QuantitativeValue](https://schema.org/QuantitativeValue). Typical properties: minValue, maxValue, unitCode (d for DAY).
In the context of [ShippingConditions](https://schema.org/ShippingConditions), use the [ServicePeriod](https://schema.org/ServicePeriod). It has a duration (as a [QuantitativeValue](https://schema.org/QuantitativeValue)) and also business days and a cut-off time.