What I have found is that guitars with hardwood tops - whether mahogany, koa or walnut - tend to take three to four times as long to fully open up as similar guitars with spruce tops tend to take. The wood of the top is harder, so it takes longer.
When shopping for a new guitar, whether all-mahogany or spruce-topped, I agree that it's best to find one that has a good sound while still brand new. That's always the safest practice.
whm
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