How long the best inflatable boats last is almost entirely a function of how well they’re cared for. If you don’t use it in ways it’s not designed for, don’t overload it, keep it clean and make sure you always deflate and store it properly you may get 10 years out of it. If on the other hand, you regularly overload it, affix a larger motor to it than it’s designed to accommodate, try to force it down whitewater it wasn’t designed to navigate and just roll it up wet and dirty and stuff it in the trunk chances are it won’t last until the warranty expires. The bottom line is that, while inflatable boats are tough and durable, they’re not indestructible. But if you don’t ask more of them than they’re designed to do and show them the respect they deserve they should be there to answer the call for many years.