A cast iron chiminea can last for many years if it is properly maintained. However, if it is not regularly used or maintained, it can start to show signs of wear and tear much sooner. Proper maintenance includes regularly cleaning the chiminea, as well as using a cover when it is not in use to protect it from the elements. If you do not properly care for your cast iron chiminea, it will not last as long as one that is taken care of.