Learning to Listen Fast

It occurred to me yesterday when I had to play back part of a voice mail message several times in order to write down the phone number that I don't listen very fast.     The person said the numbers very fast (which is a huge pet peeve of mine , but that's beside the point here.)
I guess if I started doing shorthand my listening would have to speed up.   Any thoughts on that?

(by beantea for everyone)