I've got about 100 hours into the finale from Bach's First Violin Concerto, probably over 6 months. I work on it for a couple of days and then put it away for a week. After about 30 hours (guessing here) I could play it at a slower tempo, but it goes like the wind.
I'm not under any time restraints for this one, so I don't really care how long or how many hours - as long as I don't get tired of playing it. I suppose I might if I played it every day - but who knows. I'd sure learn it faster.
I can't imagine a workable formula for how many hours to invest in a piece, but as long as you still like it my suggestion would be to enjoy the journey.
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Keith
Martin 000-42 Marquis
Taylor Classical
Alvarez 12 String
Gibson ES345s
Fender P-Bass
Gibson tenor banjo
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