The process took 1 day. I interviewed at KBR (Houston, TX) in Sep 2010
Interview
I was chosen to attend a campus recruiting event. The interview was entirely behavioral. They did not expect you to know anything about control systems. The recruiter was surprised to see that I had done multiple projects on control systems. The interview was more about the recruiter explaining the job description than a serious interview. Go prepared with questions otherwise your not going to make an impression.
I applied through college or university. The process took 2 days. I interviewed at KBR in Jan 2008
Interview
The interview process was quite detailed. They invite you a day before and have a dinner with the managers, then the next day, you have a breakfast orientation and group discussion, the core interview (2 sessions) and lunch with group of people, and the final session of core interview. I found out that they evaluate ALL aspects. Not only during the core interview, but also all the group discussions, meals, etc.