A properly installed and protected fiber optic splice can last for many years (often 20+). The lifespan depends on the environment, the quality of the materials used, and the installation techniques. Fiber optic splicing is a foundational process that directly dictates the performance and reliability of data transmission. Fusion Splicing: This advanced technique uses an. The time it takes to splice a fiber optic cable can vary depending on several factors, including the type of splice, the equipment used, and the level of expertise of the technician performing the splice.