On average, a mechanical splice can take around 10-30 minutes to complete, while a fusion splice can take around 30-60 minutes to complete. 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. Before we dive into the timeline, it's essential to understand the splicing process. Fiber optic cable splicing involves joining two fiber optic cables together.