The length of time you can store your candles or wax melts will depend on the ingredients inside of them. If you're storing candles made with paraffin wax and fragrance oils, these can last for years without their quality being disturbed. If your candles contain natural substances like essential oils or soy wax, on the other hand, these are best used within a few months. In general, try to clear candle stock within one year of making it. The sooner you can sell it, the better. This is where rotating stock becomes incredibly important for the success of your brand.