Oxidation rates generally go up in proportion to temperature - a capsule might sit inside an AC cooled house for days before going rancid, while it might only take a matter of hours in a steaming hot car trunk. Lots of electronics and other things are life-tested in a relatively short period of time by running them at high temps - every 10 C can equal a given period of time, say on month/day of operation at nominal temps - so raise it 50 C and you get 5 months of aging in 1 day (numbers are made up except for the 10 C bit - that's the real number used in the aging calculations).
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