There really is no time limit on how long a broom can last. If you look after your broom, clean it regularly, and store it with the bristle side up, it can last for years. However, if you don’t clean your broom and stand it on its bristles, you will need to replace it sooner. When you are considering replacing your broom, evaluate its bristle length and density. A broom that has lost half its bristle length and has bald patches that will fail to trap dirt when you sweep should be replaced.