If you have an extra $345 lying around, one of these 2.5 kg Jo Malone candles can be yours. I'm sure they smell beautiful, as so many Jo Malone items do, but I burn through too many candles (ha!) to spend more than $15 on one — even if it does last a long time. (Most readers spend $25 or less, for what it's worth.)
Whether you spend $1 or $100 on a scented candle, a few tricks can make them last longer. First, freeze candles overnight before lighting them; the cold wax will burn more slowly. Be sure to keep the wicks trimmed to about ½ cm, too. Not only will this help the candle burn evenly, it also reduces the amount of soot and smoke in the air. Finally, if you've finished a large pillar candle, there's no need to throw it away. Just drop a votive in the hollow part. The scent will be gone, but the flickering ambiance will remain.