Burn times will always vary depending on the placement of your candle. Drafty areas will burn slightly quicker. Burn times will also vary depending on the height of your wick. The longer the wick, the quicker the candle will burn. You can extend your candles burn time by burning the candles long enough to allow the wax pool to reach the edge. If you do not allow them to burn all the way to the edge of the container when you first burn them, they will begin to tunnel down into the wax instead of melting all the way to the edges.