Almost my entire house is furnished with IKEA stuff, bought between 10-15 years ago, and I've so far never had to throw stuff away because of wear or breakage. It's not like any of it will be family heirlooms handed down through generations like really high end furniture easily can, but I can easily see most of it lasting another 10-20 years or more.

My couch has survived 10 years of my son treating it as a trampoline, for example. Last couple of years I've had to constantly try to get him to stop jumping onto it from a running start through the living room...