I usually make my kava by heating almost 2 cups of water for 1 minute 20 seconds and then letting the powder and water sit for 30 minutes so it absorbs as much water as possible. By the end of the 30 minute sit, and the 20 minute knead it's at room temp. Last night I placed a ceramic dish on top of the mixing bowl when it was sitting and by the time it had sat for 30 minutes the kava was still pretty hot...a good bit hotter than it would be just open to the air. I kneaded the mixture for 20 minutes like usual and put it in the fridge. Apparently kneading warm kava must extract far more kavalactones than kneading room temp kava because by the time I brushed my teeth I could barely focus with the one eye I had open. So....I'll be doing that from now on.