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Learning a steno system is similar to learning a new spoken language - it takes time, and the time it takes differs based on the time you invest daily, personal experience, type of study... Some have reached 100wpm in 2 months, some take 2 years. As a reference number - to be a certified stenographer you need to pass a test with at least 225wpm with 99% precision. The classes take 2 years, I think.

Being a pianist might be handy, but you'll still need to practice a lot to see progress.