I tried heating for 45 seconds and inhaling very deep and long one time. After the trip I inhaled again to see if there was more left, there was. There was one more inhale left. I need to inhale 2x to get it all in. I figure maybe the heating element gets cooled a bit and stops vaping the dmt by the end of the first inhalation. Or maybe I need to use more chore? Anyway, 2x inhaling is fine by me.