Well if you didn't know, now you do^^. It's kind of difficult to say exactly how long parts will last because there are too many factors that will affect the lifespan of the parts. So depending on how and with what fuel you run your engine your mileage will vary. But this is what has been done by the CRF team till now, they also change the conrod at the same time just for safety.

Remember the piston does not touch the cylinder so you will not get the usual piston/liner wear you get with other engines. Obviously over time engine parts will wear out but it should take a long time.