Motorcraft SP432 plug life expectancy?

Since the plugs now have 19k, you could pull them and check their condition and gap. If they look/measure fine, reinstall for another 20-30k, rinse/repeat; if they don't look/measure fine, you'll at least have an idea how they are wearing. This way you will find out how long they last in real usage, in your engine.
 
Be careful where you buy them. There are fake Motorcraft spark plugs, ignition cos and spark plugs wires. There is a video on YouTube if it from a famous Ford tech.
 
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