Hmm, not long at all. Technically pcv are a 10k maintenance item but since they 'only' impact emissions they're typically left off service lists. Granted, the materials for them have improved greatly so they really should last 30k under normal conditions. I wonder if the extra pressure is just wearing it out faster, or maybe after enough oil sloshes through it degrades? I didn't have issues on track for nearly two years (I did at autocross though), and then suddenly it was an issue when one day was particularly hot.BL PCV went on July 2019. 39k at that tme. Now it has 45kish. So it lasted 6k miles.