Iain Smith writes:

Nothing because that wasn't what you said. You weren't talking about mean
time between failures (in case you thought I didn't understand), you stated
that jet engines (implicity individual units within the context of this
thread) could run for hundreds of thousands of hours without failure. This
is patently not true and has not happened yet.

The alleged fact that it hasn't happened doesn't prove that it cannot. And
how do you know it hasn't happened? Is someone keeping track of the worldwide
record for running time between failures?

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