If it is designed for the street it should last a long time. The reason I used 10,000 miles is that is when my intake valve broke on the cylinder head so I had to repair the the engine. The cam and lifters were fine. I sold them at the swap meet to another guy building a street engine. The roller lifters were still good, but they can also be rebuilt. Just about all production engines that use lifters since the late 1980's are using hydraulic rollers.