<p>I don’t know any hard stats, but I think a decent number of MIT faculty in engineering went to MIT as undergrads – some are even MIT cubed (SB, SM, PhD). </p>
<p>My husband’s favorite professor is MIT cubed, and he was awarded his bachelor’s and master’s concurrently in 1983, then his PhD in 1985. Crazy. </p>
<p>Another of the advisors to my husband’s company, a really gifted aircraft designer, took seventeen years to get his bachelor’s in course 16. It’s not that he had trouble with acing his classes, he just kept taking time off to design interesting things (e.g. [Daedalus](<a href=“http://en.wikipedia.org/wiki/MIT_Daedalus]Daedalus[/url]”>MIT Daedalus - Wikipedia)</a>), and by the time he would get serious about going to classes again, he’d find there was a new set of requirements to fulfill before he could graduate. There are a number of people like him who never let school interfere with their education.</p>