My experience is that there is an initial perceived "opening up" of a new guitar in as little as one to three days. This may be due to the acclimatization of a new instrument to its new environment and to the player's feeling of the new guitar. After that, I can't say when another noticeable "opening up" may occur because it usually happens so gradually that I haven't noticed it.
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Martin HD-28 Sunburst/Trance M-VT Phantom
Martin D-18/UltraTonic
Adamas MD80 NWT
Adamas I 2087GT-8
Ovation Custom Legend LX
Guild F-212XL STD
Huss & Dalton TD-R
Taylor 717e
Taylor 618e
Taylor 614ce
Larrivee D-50M/HiFi
Larrivee D-40R Blue Grass Special/HiFi
Larrivee D-40R Sunburst
Larrivee C-03R TE/Trance M-VT Phantom
RainSong BI-DR1000N2
Emerald X20
Yamaha FGX5
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