One initial phone interview that lasted around thirty minutes. About a week later, I was told I would need to complete a math case study, and would be scheduled for two back to back phone interviews. The math flow question was not particularly difficult, they were mainly interested in seeing how you approached and solved the problem, not necessarily your answer. The first of the phone interviewers, an Area Manager, asked me to explain my thought process for the math question, and for the rest of the call focused on a more behavioral case study. The second phone interview was another Area Manager, who asked pretty standard "tell me about a time" behavioral questions.