This is a highly tenuous question, as, as with most things, it very much depends upon the quality of the product you purchased as well as how well you have cared for and maintained it. In ideal circumstances, snorkeling gear can last many years. The mask is usually the first part to deteriorate, as the silicon may warp or become rigid over time leading to leaks. If treated too harshly, straps are also a part of your kit that is prone to failure. Luckily, many brands do often replacement parts.