The process took 1+ week. I interviewed at Capgemini in May 2011
Interview
Interview consisted of questions on Unix and ITIL concepts. Ability to manage time while responding to incidents - maintianing communication was tested.
The process took 2 days. I interviewed at Capgemini (Atlanta, GA) in Nov 2011
Interview
First round consisted of 2 45 minute case interviews one on one with a recent MBA hire. Cases were not terribly difficult.
Second round was in the company office. 2 more case interviews and one 15 minute behavioral interview with executive level. Degree of difficulty in 2nd round cases harder.