I have an Epson SX215 printer. Can I buy multiple cartridges without being worried about their expiration time? I plan to have around 3 of them, and for me they might suffice for about half a year. Can they go dry in 6 months?
Like batteries, ink cartridges normally have an expiration date printed on them - or on the cardboard box they are packaged in. You can expect cartridges to work at least until that date, if you don't open the packaging.
Once you open the packaging, you should expect the inks to dry out within 2-6 months depending on brand, weather, and other factors.
Out of protection, the ink will go dry whether in the printing heads of the cartridge or just on the sponge used to spread the ink :( It also depends on the weather conditions (dry/cold/hot...) I can't give an estimation... however 6 months looks big. Maybe you can remove them to protect them somehow?