over the course of
In or during the process of. Over the course of your employment in the company, were you ever aware or suspicious of any illicit financial activity going on? I learned over the course of the meeting that our department was being downsized by over 50 percent.
in/over the course of...
(used with expressions for periods of time) during: He’s seen many changes in the course of his long life.The company faces some major challenges over the course of the next few years.