How often should you replace a PC?

As a cryptocurrency and finance professional, I'm often dealing with complex software and hardware setups that require a lot of computing power. So, the question arises - how often should I be replacing my PC to ensure optimal performance? Do I need to upgrade annually, or can I stretch it out for a few years? And what are the key factors I should consider when making this decision? With the rapid pace of technological advancements, I want to make sure I'm not falling behind and that my hardware is supporting my work needs.