How long do opened HP toner cartridges last? (if properly stored!)

Jul 23, 2020
I bought this M254dw 7 months ago. It was apparently a demo and had starter cartridges in it that only had a couple pages use on them. The printer showed no wear at all. Has original firmware on it.

So I figure cartridges have been opened and in printer for a year, maybe 2. They still have a few months use in them at the rate I use them so I will store them (air sealed, moisture removal packet, dark, horizontal, correct side up) when I get my new 202A set (genuine HP) in a week or so. They have worked flawlessly so far. Does anyone have experience of a stored HP toner cartridge going bad? Thanks!

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