On average, for a typical CIE Bookstore certificate course, most students complete a lesson in 10 to 14 days.
This is an average, though, and completion times for different lessons vary quite a bit. The introductory lessons at the beginning of most of our courses do not take much time to complete. But the calculus lessons in the math courses and other advanced electronics formulas take a little longer.
Accordingly, we expect students to need more time to complete them than they do for the introductory lessons.