Actually, 70 days is much too long for 0.2" thick spruce. I typically cut red spruce tops when the wood is green, because letting it dry in billets invites problems with cracking and blue stain.
A sopping wet guitar top will be dry in a few days if it is put on sticks and a fan is used.
There is no problem with warping of quartered spruce.
Although the wood will be stable once it reaches equilibrium moisture content, it may take over a year for the pitch to crystallize at ambient temperature. The good news is that you can 'set the pitch' in a few minutes by warming the wood to about 180 degrees.
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