The delivery time window indicates a time span in which a delivery is to be delivered. The delivery time must be within this predefined time window. Of course, this extra delivery time means a higher outlay on service providers and a higher price for the shipment, but the sender can be sure that the recipient will receive the package at a certain time. This greatly simplifies packet acceptance if the receiver is found only at certain times. In order to minimize the transit time for urgent shipments, so that they reach their destination at the times indicated, these shipments are treated separately. The delivery time can be 24 hours for express shipping and will be delivered at a given delivery time.