This will all depend on the amount of use these Whips get and if they are looked after correctly. Unfortunately with Poppers/crackers due to the nature of the use on this product they will need to be replaced often. The thong however if looked after correctly and not used on or for whipping hard surfaces should last much longer. When the flame on your Whips starts to get to a flickering stage, this is when you will need to put the flame out straight away as any longer the fuel will stop burning and the thong will start to smoulder which can lead to deterioration quickly.