These 8oz containers are filled with 5.7oz of soy wax for optimal burn time that will range from 30-40 hours, following the instructions below. New to wood wicks? You'll notice a little "crackle" sound as they burn. Keep wicks trimmed to 1/8" - 1/4". After burning, and once the candle has fully cooled, you can "trim" by simply flicking off the burnt part of the wick.