"Using a simplified version of GEMLAB, Bunge, Baumgardner and their colleagues were able to show that it takes about 150 million years for plate material to travel from the surface to the mantle-core boundary."
If he's trying to 'prove' a young Earth in his off time?
Sounds like a schizo.
Why don't you ask him, instead of belittling him? Oh, I know, it is too hard to write a simple e-mail.