The answer to 'how long does drain last' is that the lifespan of a drain can vary greatly, typically ranging from 15 to 50 years or more, depending on the material, usage, and maintenance. Drains made of metal or plastic materials like PVC tend to last longer than older materials like galvanized steel. Regular cleaning and maintenance can also extend the lifespan of a drain.
However, factors like frequent clogs, corrosion, or damage can shorten a drain's lifespan significantly. It's important to monitor your drains and address any issues promptly to prevent bigger problems down the line.