I speak here for the off campus hiring process for students in universities outside of United States. The interview process consists of an offline programming exercise on the website InterviewStreet. The same leads to 2 (or in some cases, upto 3) phone interviews all coordinated by your location's recruiter. The interview process is very flexible and the dates can be easily set up around your schedule. It took me a little over a month to go through the entire process although the same could be wrapped up within 2-3 weeks if one desires.