Service life is a term used to describe the amount of time a product or piece of equipment can be used before it needs to be replaced. Synonyms for service life include lifespan, operational life, working life, longevity, durability, and viability. These words help to describe the overall usefulness and reliability of a product, and are often used in discussions around maintenance, repair, and replacement of equipment. Ultimately, understanding the service life of a product is key to managing it effectively and efficiently, as well as ensuring that it operates safely and meets the needs of those who rely on it.