i've read anywhere from 15 minutes per 1/4" thickness to an hour per 1/4" thickness. i want to say the Northstar glass brochure says 15 min per 1/4"....i stick mostly to NS color so that is what i based my annealing cycle on. i've had zero issues with cracking, save for my own stupidity in trying to encase chrome colors (fucking millenium falcon looks great deep encased, but will crack every time).
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now i've got a Mirage
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