How long is fuse good for?

Could you please elaborate on the intended context of the question "How long is fuse good for?"? Are you referring to the lifespan of a physical fuse used in electrical equipment, or are you asking about the duration of effectiveness for a metaphorical "fuse" such as a timed explosive or a trigger mechanism in a financial or technological context? If it's the former, the lifespan of a fuse can vary greatly depending on its type, quality, and the conditions in which it's used. If it's the latter, the answer would depend on the specific context and the purpose of the "fuse." Could you please provide more details to help me give a more accurate answer?