It took be about five minutes of practice, and the coin started jumping. I guess the time you'll spend, and the ability to learn it all, has something to do with your the shape and dryness of your hand. I have friends of mine that haven't been able to learn it all - and they have been struggling for a very long time. You will most likely go through a hard time with blisters and bruises before you finally succeed, or decide to give up. You need a fairly large coin to make it look good, and work properly.
Most people tend to use coins at the same size as American half-dollars and old English pennies.
I have been talking to does the Muscle Pass very well. I try to use Norwegian currency and whatever coins I have lying around. Right now I am using a Silver Half-Dollar from 1964 that is practical, and looks very nice. I am sure I can make it go more than 50 cm straight upwards on a lucky day. The big problem with light coins is that you loose control and it gets harder to catch.