Blu-ray M-DISC has been available since 2013, I believe. One article from 2013 mentioning Blu-ray in the context of M-DISC: https://www.zdnet.com/article/tortur

Blu-ray M-DISC has been available since 2013, I believe. One article from 2013 mentioning Blu-ray in the context of M-DISC: https://www.zdnet.com/article/torture-testing-the-1000-year-dvd/ https://www.zdnet.com/article/torture-testing-the-1000-year-... So, 10 years would be a good starting point, but probably on the short side of things.