How often do 2-strokes need to be rebuilt?

As a cryptocurrency and finance practitioner, I'm typically not involved in the mechanics of engines or automotive maintenance. However, if we're applying this question metaphorically to the cryptocurrency world, I'd pose it in the following manner: "Within the realm of cryptocurrency networks and their underlying infrastructure, how frequently do key components, analogous to the '2-stroke' engine, require reconstruction or overhaul? Given the constant evolution and advancement in blockchain technology, is there a recommended timeline or set of indicators that suggest when a significant overhaul or upgrade may be necessary to maintain the network's efficiency, security, and scalability?