From my experience, as someone who takes lessons, 30 minutes can be fine. I began taking vocal lessons and it was something I was completely new to. And at first I was also unsure if 30 minutes was enough. But my teacher turned out to be really great and I was learning and improving a lot. Of course that was providing that I practiced. Now I'm getting a little lazy with the practice so the improvement isnt how I'd like. I guess its one of those things you get what you put into it.
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