The average time required for fiber splicing can vary depending on the complexity of the job, the number of fibers to be spliced, and the experience of the technician. On average, a single fusion splice can take anywhere from 10 to 30 minutes, including preparation and testing. In this article, we will delve into the details of the splicing process and explore the. As fiber optic cables are generally only produced in lengths up to around 5 km, so when lengthier connections are needed, splicing two cables together becomes necessary. At Turn-Key. Fusion splicing joins two optical fibers permanently using an electric arc. Compared to mechanical splicing: The Telecommunications Industry Association (TIA-568.