After THCA flower is heated and the THCA is converted into Delta 9 THC, the length of effects can truly differ. It's based on your individual body chemistry, the manner in which you partake (inhaling vs. edible, for instance), dosage, and personal experience with cannabinoids. Generally, effects of inhalation THCA flower from KillaKush can last anywhere from a few hours,whereas other methods may take longer.