As we provide the only wick-less oil cartridges on the market, we've had to sacrifice some durability to deliver a more enjoyable vaporizing experience. Following our guidelines provided in this section, you should expect 20-50 uses out of your oil cartridge. Of course this depends on how high your heat setting is, the quality of wax, and a few other variables. The reality is the oil cartridge is designed with a lifespan in mind, and for this reason we sell packs of five so you don't have to order single replacements.