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There are (legendary) guys who have gotten their PhD's from MIT in one year. No, that's not one year after their master's, I'm talking about 1 year after their bachelor's.
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<p>Funny you mention this. An alum once told me that a friend of his attained a phD in math; his entire thesis was 1 or 2 pages long. I don't recall how long it took him, but from the sound of things, I don't think it was quite long. (I also think this particular guy won the Putnum).</p>