Outdoor temps at this time of year as you described is not conducive to allow accelerated aging to any degree. You most likely wont achieve the desired results with your method.
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until you put it in the Hotbox, you were sposd to make out of someone's free dead freezer with a light bulb in it, and indoor/outdoor thermometer set up backwards.
Its in Nick Wyshinski's book. You were sposd to ask loved ones for all 3 of his books for Christmas. Didn't they get the memo?