How long can new erasers last if packaged?

I may have gone overboard when buying erasers haha... i have a handful (no joke) of them now. At least 4 of them are good quality, so i don't want to waste them. Also, i used to have a brand new eraser (unused but without the packaging plastic) stored in a box. About 5 years later, it was completely unusable... show more I may have gone overboard when buying erasers haha... i have a handful (no joke) of them now. At least 4 of them are good quality, so i don't want to waste them.

Also, i used to have a brand new eraser (unused but without the packaging plastic) stored in a box. About 5 years later, it was completely unusable and smudged every time no matter if i washed it or not.
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