There's no one-size-fits-all answer, but a good rule of thumb is to plan on repainting or refinishing wooden benches every 2 to 3 years. However, this schedule heavily depends on several key factors. The bench's material is primary; softwoods like pine may need attention more often than durable teak or cedar. Your local climate is a major driver. Benches in full sun, heavy rain, or salty coastal air will degrade faster than those in sheltered, mild conditions. Simply put, harsher weather means more frequent maintenance.
Usage also plays a big role. A bench on a busy patio or public park sees more wear and tear than one in a quiet backyard. The type of finish matters too. A high-quality exterior-grade paint or solid-color stain typically lasts longer than a transparent oil or varnish, which may need yearly refreshing.
Instead of just marking your calendar, make inspection a habit. Once or twice a year, look for clear signs it's time for work: peeling or cracking paint, a faded or grayish appearance on wood, water no longer beading on the surface, or any feeling of roughness or splintering. Addressing these issues promptly prevents minor wear from turning into major damage, ultimately extending your bench's life and beauty for many seasons to come.