I also change my wicks out every 2-3 days. I use a soft bristle toothbrush, dipped in water to brush off the coils and fire them to dry. I normally will change my coils when either, I can no longer get them to fire together, or one just doesn't burn as hot as the other one. Normally, I will average about 10-14 days on a set of coils, depending on how much I am using it.