In the packing slip customization tool, it would be very helpful if there was a Field Replacement for "delivery time" or "transit time" based on the carrier, the selected shipping service, the shipping location, and the destination location of each order. Wouldn't it be possible to get this information from each carrier's API?

Our company sells frozen meats and we need to see the estimated transit time as we pick and pack so that we know how much dry ice to include in each shipment to keep it frozen during transit.