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How long do unopened HP inkjet cartridges last before drying out from

Right now there’s a sale where I can get HP ink cartridges for my printer for 25% off, but because part of the savings is a volume discount, I have to buy at least 6 combo packs (1 black + 1 tricolor each). Should I be worried about some of the cartridges’ drying out before I ever get the...