Candles should be burnt for a minimum of 1 hour for the first burn (or until the top layer has completely liquified). This will prevent tunnelling. Candles should not be burned for more than 4 hours at a time. When there is only 1/4 inch of wax left in the jar, candles should not be lit. We recommend trimming wicks before each burn. Keep candles in a cool place to prevent sweating when not in use.