If it wont start 20 minutes after being ran, I doubt its really just the glow plugs. I would be looking at compression. Has he done a compression test?
How about lack of fuel pressure? has he done a pressure test/leak off test?
Air leak into the fuel system?
A diesel that's just cooled for 20 minutes should start reasonably well, glow plugs or not.
Mind, the combo of the any underlying fault, and no glow plugs means come the winter this thing is going nowhere fast.
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