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The advice feels pretty circular. To stay motivated, do it for 3 years. If you can commit to something for 3 years, you already have the motivation.
Regardless, I disagree with this advice. Give it a month, tops. If you don't enjoy the process after a month and the goal is 3 years away, you won't get there.
From my experience, I stick to doing things because of the rewards along the way. After a month of playing an instrument, learning a language or trying a hobby, I will likely produce something that makes me want to keep going. It won't take 3 years.
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