Well, that piece that looks copper-ish took me two hours. However, that is because it has that coating on it...it needs a LOT of work to look "chromed". I will get pictures next time I detail the car. The other parts won't need nearly as much work, since they have no coating to get off before you can get to the bare metal.
Was that coating important? Oops

I also hit my KKM aluminum oil cap, it looks a little better now. More reflective. I would love to polish my battery brace, but it has the black paint on there and would probably be more trouble than it's worth.