It is impossible to predict time. Once again you go off spouting rhetorical questions. It doesn't matter if it is steel, aluminum, titanium or any other metal or compound. You cannot predict time. If you could then everyone would know that their motor is going to break down ahead of time rather than after it breaks. There are hundreds of factors that are going to determine if a bearing or any other component gives out prematurely. Metal particles, how often they clean filters, how much debris has been sucked in, the type of fuel, of lean or rich they run the motor. The list doesn