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Cobalt blue reflects UV, which is the bete noir of Cannabanoids, and cold temperatures reduce the rate of THC de-hydrogenizing into CBN, so your storage was optimum.
Bottle shape will also affect the rate, because the more surface area, the faster the hydrogen in the THC can combine with the O2 in the air.
In the reaction, time and temperature are closely related and to some degree interchangeable. Elevate one and it lowers the other.
More directly, I haven't a clue as to the exact number, because some of my year old plus samples are still potent and I read where a huge block of 10 year old hash was sampled for THC content and where it was pretty bleak on the outside, it was still full potency in the center where it had not been exposed to the atmosphere.