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Yes, I would say that whoever gave that estimate was exaggerating by quite a ways. Using the TPT, popping hair on your arm ..... if you have any left by then :) ..... you'll know when you've reached...

Assuming the razor was honed to the level to be ready to go beyond the 8k the 'jump' to 12k is a normal progression AFAIC. Shouldn't be any problem at all.