It would take around five years to become assistant finance controller. Enter the Senior Management. To become a finance director, you first need to enter the senior management of the company. This is possible after gaining around ten years of experience in the field of finance.eing the leading person in the department of finance, the finance director has to form teams, assign work and help in planning as and when they need. In short, the ultimate aim is to make sure that the firm achieves its financial goals or objectives in a planned way. High School Preparation.