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You probably aren't going to see any change in 14-15 hours. Give it a few weeks and it will probably be back to where it should be, or close. Room humidifiers are kind of a hassle becuase you have to keep filling them up with water and keeping them clean so that you won't spread bacteria through the air.
Furnaces can be harsh to a guitar. It can hurt more than just the fretboard.
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