This OEM belt lived outside in a dry, high desert climate and experienced all four seasons and about six years of not extreme weather and non-aggressive driving. Lots of cracks evenly spaced throughout, but no missing pieces. Next replacement coming up, at about 250k miles
Mine lived in a less harsh environment for 5.5 years and 150k mile when I replaced it along with the thermostat, the ICE coolant pump and the Inverter coolant pump. JeffD