How can I make my candles last longer? First things first, put the candle in the freezer. Yes, the freezer. Sprinkle salt into the liquid wax of the candle. After letting the candle burn long enough for a pool of wax to collect around the wick, go ahead and blow out the flame. The first time you light it, let the candle burn a sufficiently long time. Finally, remember not to leave the candle near a door or window or in any similarly drafty spot; not only is such a location unsafe, but it can also result in uneven burning.