What does Reagan 10 mean by buying a car?

The Soviet joke that Reagan publicly told in those days.

It is said that it takes 10 years for the Soviets to order a car. One day, a guy went to pay the money and was told to pick up the car 10 years later. He asked whether it was morning or afternoon. People will think, ten years later, whether it is morning or afternoon matters. He said that because the plumber was coming that morning.

This is a satire on Soviet efficiency! Russians are famous for their laziness!