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I change them "on condition", that is, not at a set time but when their performance and appearance suggests a change. Typically, I inspect all plugs when the annual is done, since they come out for the compression check.
I would guess that they have been lasting about 500 hrs, but this is just a guess. It also depends on how you run your engine and probably whether it's a turbo or not. My experience is with normally aspirated and running at cruise 50-75 degrees rich of peak EGT, a setting which in my experience keeps the plugs nice and clean.
Saludos,
Ernie
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