I applied through college or university. The process took 1 day. I interviewed at KPMG (Luxembourg) in Dec 2015
Interview
I had to full fil a 30-minutes technical test (questions were about accounting, auditing and finance). Then I had an HR interview (questions about background and motivations, why auditing, why kpmg). Finally I had one interview with a director from the business unit I applied for. Everything was done on the same day. Not a lot of technical questions.