This question is also difficult to answer. It depends on a variety of factors, such as the type of work you do, the amount of time you spend on your feet, and the climate you work in. Some people recommend changing your boots every six months, while others suggest only doing so when the boots start to show signs of wear and tear. Again, it comes down to what is most comfortable for you. If you are having problems with fatigue or discomfort, then it might be time to switch up your footwear.