That's a great question, and one that city planners and facility managers think about a lot. From my experience observing and maintaining urban infrastructure, the durability of those foot pedals is a mixed bag, heavily dependent on quality, usage, and environment.
Honestly, a well-made stainless steel pedal mechanism on a commercial-grade bin can last for years, even in a moderately busy area. The key is the build. Good ones use thick 304 or 316 stainless steel for the hinge, spring, and linkage. They're designed to be simple—a lever, a pivot point, and a strong return spring—with fewer parts to break. You'll often see these on bins in corporate lobbies or nicer municipal parks.
However, the "urban" part of your question is the real test. In a high-traffic subway station or a public square, it's a different story. The durability gets hammered by constant, sometimes abusive use. Think thousands of presses per day, occasional kicks, and exposure to all weather. Cheaper models with thin metal or plastic components might last only a year or two before the spring fatigues, the hinge loosens, or the linkage bends. Salt in winter air accelerates corrosion, even on stainless steel.
Maintenance is the unsung hero. Bins that get regular cleaning and a quick check for loose bolts or squeaky hinges last exponentially longer. A simple spray of lubricant on the pivot points twice a year works wonders.
So, the real answer? A quality foot pedal mechanism, under typical urban conditions with some basic care, should deliver reliable service for 3-5 years minimum. For the toughest spots, specifying heavy-duty, commercial-rated bins from the start is the only way to go. The initial cost is higher, but it pays off by avoiding constant replacements.