The process took 1 day. I interviewed at MIT (Lexington, MA) in Feb 2009
Interview
I gave a 45 minute presentation on my current work, then met with 3 separate individuals for 1:1 interviews. The interviews were respectful give and takes where we had opportunity to discuss my work and the company's activities. The questions were appropriate and not terribly hard.
The HR department is very disorganized. I only had 2-day notice of my interview, and that a presentation was expected.
Interview questions [1]
Question 1
They asked about technical details related to my work. The questions were all specific to my research work.