When lighting for the first time, burn until the wax melts evenly across the entire surface of the candle as this will prevent tunneling and create an even burn for the duration of the candle's life.
It is recommend that you trim your wick before every lighting. The wick only needs to be approximately 1/4 cm in length. Keeping it this length will avoid mushrooming which can result in unnecessary soot. This also controls the size of the flame allowing you to get the most time out of your candle
Your candle should not be burned for more than 3 hours at a time during the first third, then for 1 to 2 hours afterward.