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Old 01-17-2020, 10:56 AM
Chipotle Chipotle is offline
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Join Date: Aug 2016
Posts: 728

Originally Posted by neofolk View Post
My question is how FAST it could hurt the acoustic guitar? I suppose it's meant rather in the long term?
Since I didn't see this answered directly: days to weeks. It takes that much time for the moisture to evaporate out of the wood; a few hours in a dry environment won't destroy the guitar, probably even a day or two. Then, even if it starts to dry out and move, it doesn't necessarily crack or separate right away--if at all.

I used to not humidify, and have an HD-28 that never developed any cracks. However, the "fret sprout" from the fingerboard shrinking was annoying, if not actually dangerous to my fingers! Humidifying resolved that, so plenty of good reasons to do it even if your guitar doesn't spontaneously self-destruct.
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