I went through three rounds (out of four). All interviews lasted less than 1 hour. The other reviews are extremely helpful in order to prepare interviews. I would just highlight how important it is to review asset classes basics (bonds, options, etc.), specially if you don't have a financial background. Also you should carefully prepare financial news as you will be asked to bring out a relevant topic for you or prompted to discuss one of the interviewer's choice. You should have a good understanding of the most relevant topics, such as ECB's QE (try to remember some figures and specific facts), and also prepare something more focused on the specific region you will be working for, e.g. if you are applying for an Italian speaker position, mention something relevant about the Italian market.