I have a residual memory for subject matter of about 72 hours that I found useful for examinations in college. From no knowledge of a subject to studying it by

I have a residual memory for subject matter of about 72 hours that I found useful for examinations in college. From no knowledge of a subject to studying it by reading only then I can retain just enough info to pass before it all evaporates. Not the same but it served me well for a few subjects that I needed to pass.