I believe 250k is about typical on those pumps and the vp44s when they are treated right. Fuel quality and temperature will change that number drastically, on these style pumps its really important to not starve them of fuel pressure. That may have been what caused your pump to fail or it could have been contamination. I never opened it up since it was an exchange with bosch, but Id wager your pump failure was not typical wear and tear since something had come apart inside it.