Everything digital essentially has the archival permanence of a sand painting. Whether it is a computer, hard drive, CD/DVD, memory card or even an inkjet print, at some point it is going to fail, fade or completely disappear. There is no definitive testing available to guarantee archival permanence. There are institutes that rate paper and ink combinations for extrapolated age testing against UV light and other factors that we know affect inkjet prints like ozone. Your best chance at archival permanence is using pigment based inks with fine-art papers. Then spray with a protective spray coating and store the prints either in total darkness or at the very least, in a frame, matted away from the glass and not in direct sunlight.