2 hours or so. Cordyceps flowers can not be eaten raw, cold also need to be blanched after boiling, generally fresh Cordyceps flowers cooking time is shorter, only about 5 minutes to cook, and dried Cordyceps flowers are mostly used in soup, cooked about 20-30 minutes, but usually with the stew material cold water in the pot, fully cooked for 2 hours or so before leaving the pot, so that is conducive to Cordyceps flower efficacy analyzed to help the human body better absorption of its nutrients.