10 days According to relevant information, grapefruit tea needs to be dried for 10 day until the dried grapefruit peel is sealed and put in the refrigerator. The longer it is preserved, the better it tastes. Grapefruit tea is a traditional folk health tea in Fujian. This kind of health tea has the effect of eliminating diseases and preserving health, and the older citron tea is, the stronger the effect is.