About how fast would African shea er work on acne scars?

Like my acne is really bad and Ive been trying alot of stuff to get rid of atleast my scars and the stuff I use its helping a little but, I want something that will help faster. My brother told me about how shea er helped his girlfriend in a week with her stretch marks and Ive read a little how it helps with acne scars. But I really want to know if it works as fast on acne scars as it did with her stretch marks?