I had a computer based test, realistic job preview and interview on the same day. The test lasted about 2 hours with questions in verbal reasoning, basic math, error detection (testing attention to detail), and a sort of personality test. The realistic job preview introduced us to what the job was like. The interview itself took about 15-20 minutes. With each question I was asked, it seemed I was been graded (perhaps to decide if I was a good fit for the job).