In our outdoor bench factory, we tell customers that a teak bench does not have one fixed expiry date. For a typical well-made bench using mature teak heartwood, stainless steel or brass hardware, and tight mortise-and-tenon joinery, the usual residential lifespan is about 10 to 15 years in normal outdoor conditions. With annual cleaning, occasional light sanding, and a protective oil or sealer if desired, that same outdoor teak bench often reaches 20 to 30 years. Some premium teak garden benches in sheltered patios or covered porches last 30 years or more, developing a silver-gray patina while keeping their structure. Poor-grade sapwood, loose dowel joints, exposed screws, constant moisture, and no maintenance can shorten service life to roughly 5 to 10 years. Climate matters: dry heat may cause checking, while humid tropics can encourage mold and mildew on the surface. Our factory recommends a simple care routine: rinse with mild soap, brush gently, let it dry, and tighten hardware as needed. Because teak is naturally weather-resistant, a quality bench is a long-term investment, not a seasonal purchase. If you choose a factory-built teak bench with good materials and care, you can reasonably expect 10 to 15 years as a baseline, 20-plus years with consistent maintenance, and decades in favorable conditions.