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December 6th, 2012, 22:06
Found this:

The recordable media used in red laser disc technology like DVD's and CD's is an organic dye that is very sensitive to light. Blu-ray disks, however, use a combination of silicon and copper which is bonded during the burning process, this alloy is much more resilient than the organic dye. Manufacturers claim a life span from 100 up to 150 years for Blu-ray disks.✝
No I think that is talking about bought BR's, not burned ones, but it seems reasonable that they would last at least 10-20 years. I keep mine in sleves in the locked safe, so they aren't getting degraded by light (or temperature) either.

And discs are pretty cheap now. I think my last 25 spindle was something like $15.

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