Here's a recent example of the PO service in South Africa, and it's a description of the "norm" vs an exception.
On Dec 9th an envelope was posted to me from Germany using DHL as their carrier. It was handed to the SA postal service on the 15th Dec.
I finally received it at my local PO on the 25th of January.
Perhaps technology will eventually advance to the point where every home will have a replicator, and items posted to us will arrive as digital code and be replicated in our homes minutes after being ordered and we can all say goodbye to those hundreds of people who simply don't seem to be able to handle the volumes of packages requiring processing every day.