A longer wick creates a larger flame, a larger flame melts the wax faster and the wax melts faster than the wick, so the flame gets larger as the candle burns down. Keeping the wick trimmed and burning 4-5 hours at a time slows everything down so you get to enjoy your candle for longer and more often will provide a deeper cleanse removing water-based debris like sweat and dirt without drying or stripping the skin.