How long should I burn my candle? It's good to be concerned about the length of time a candle should be burned. First of all, soy wax has a memory and should be allowed to achieve a full melt pool on its very first burn. If it is extinguished prior to allowing a full melt pool, all subsequent melt pools will not go past the first one. To create a full melt pool, burn the candle for a minimum of one (1) hour for every inch of its diameter. All future burns should follow the first one's path and melt fully to the sides. And depending on the diameter of the container, those future burns should be no longer than four (4) hours. Just follow the rule for creating a melt pool to calculate the length of time a candle can burn safely.