How long is the campus recruitment interview of Jinan Meide Foundry Co., Ltd.?

The general interview procedure is: the preliminary interview of the human resources department-grasp the basic quality of the candidate, the professional ability is grasped by the professional department manager, and one or two interview procedures are generally added for important positions and managers, and senior leaders interview. How should these leading interviewers interview candidates? My experience is: one talk, two talks, three questions and four answers.