The process took 1 day. I interviewed at Lockheed Martin (Fort Worth, TX) in Feb 2010
Interview
There was one 2 on 1 interview which was behavioral but you have to have technical knowledge to seem competent. The whole process was fairly simple and the fact that they had food while you waited (1+ hour) was nice. It actually snowed while I was there but they helped me get out in time. Overall it was a good experience.