Nielsen Quantitative Executive interview questions

Applied via Nielsen website, HR team contacted me within a week but it was very long (1 months) before the 1st interview with HR team, where they basically had a very friendly talk with you, ask about your expected salary / benefits and explain the whole selection process. After this interview, there was a case study with I need to complete within 24 hours, followed by a presentation. The last round was the interview with Hiring Manager of the department.