How long do permanent magnets last like Neodymium magnets?
Sorry, I don’t know the answer to your question. But, here’s a link to a site that might have the answer.
ETA: Please post any info you get. I’m kind of curious about that, myself.
Per the FAQ:
I recently heard a talk on the Alpha Magnetic Spectrometer; they tested the same magnet assembly in 1997 and 2010, and found no detectable change (cite).
Thanks Nametag!
(I would’ve done it, but I was pressed for time.)