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Serpentines can last up to ten years an an average car. When looking at the belt on the ribbed side, you need to replace it when there are two sections of ribbing missing within two inches from each other. If there is a small(1/2) piece missing from 1 rib, the belt is fine.
The US service manual states that the timing belt should be replaced at 72 months (6 years) or 90,000 miles. The vast majority of NSXs hit 6 years well before they are anywhere near 90k miles so many owners are wondering if they really need to change the belt at 6 years. The safe answer is to replace it per the maintenance schedule.