I do not preheat . Lil'Bud as NO heat up time . Ok , maybe a second or two . Fine 2-3sec since the builder says so, haha . That said, I like to press the button and immediately put stem to mouth and start inhaling , slowly. My theory is that I can get the low end temp terpenes and even keep the bowl very fresh for a good amount of draws doing so . Anyone who has viewed my last video as witnessed me realizing very early in the first draw I had forgotten my battery safety tab on. . How would I have noticed right away if not for the fast heating insta Heat Lil' Bud ? Oh I got me some nice tubes from Alan which i will share about next day or two. One word for now, wicked! Vape on !