In a mock interview, two candidates practice and simulate a consulting case interview online via video or audio call. In the first round, one case partner will take the role of the interviewer, whereas the other one will take the role of the candidate. A case usually takes 45 minutes and then roles are switched. A back-to-back meeting, therefore, lasts about 90 minutes. After the interview, candidates should give each other feedback, as this will help them learn and improve their performance.