Never leave your candle unattended.

First Burn.
To avoid 'tunnelling' (where wax burns unevenly) burn your candle for a minimum of one hour the first time you light it.
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Burn For 4 Hours Max.
After burning for a maximum of four hours, extinguish your candle and allow to to cool for two hours before trimming the wick and relighting. This ensures more even burning and a longer lifespan.

Trim The Wick.
Every time you extinguish the candle allow it to cool to room temperature. Then trim the wick by half a centimeter before relighting. This presents soot from forming.