Interesting.
“For example, an actively decaying film at A-D Strip level 1.5, stored near or at room conditions, may reach critical condition (A-D Strip level 2) within five years. The same film kept in cold storage (e.g., 2°C, 50% RH) may take 75 years to experience a similar change.” link
blah blah blah “Decaying films stored at cold or freezing temperatures need to be rechecked at least every 25 years.” LOL!