You kind of have to take into account that the sender has to go in the PO,stand in line and fill out a customs tag.+1 for this
No electronic shipping label on these like you can do for US shipping.
To me it does not matter that much as I have a small town PO with hardly ever a line.I have shipped from the PO in Knoxville a few times and every time I had to wait in line anywhere from 15 min to over an hour.