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Coz the paper gives a function for extrapolating from these tests. This is purely testing thermal decay.

10,000 years sounds like a good benchmark and isn't as obviously ridiculous as saying a million years at 260°C

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It's common to perform longevity testing at higher temperatures to simulate longer lifetimes, in account of nobody has decades of time to actually perform a 1x time test.
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I wonder if "damp" modes of decay could still damage them though, which isn't captured in this style of testing. Like some wet chemical or biological process.
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Mechanical decay would also damage them. I think it’s assumed that the media will be stored in a place protected from humidity, chemicals and hammers.
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Yes I suppose a strong casing can protect against all that, but not against temperature so that's the one thing they still need to test for.
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