In my experience they last a little longer. I even have people who set them on their nightstand and open the lid, never using a warmer. (They last a long time good for them but repeat sales slow down - LOL). There are several warmersmout there in the market and some have different wattages, so if you try doing a comparison that may figure in - just a thought. Personally, OK many of you cringe, I use a coffee cup warmer. BUT advise and sell regular candle warmer. FWIW