I did mine 2 weeks ago and it took about the same time. I live about 3/4 mile from a small refinery and have bitched multiple times about cataylst dust on my stuff when somebody there screws up. I had small black spots, pin head sized, all over my white truck. I had to keep kneading the bar back into itself but I forgot how shiny my truck could be. It was white again, really white. You can actually feel the difference. It was rough before and now is slick as cat shit on a linelouem floor. Well worth the time and you would be amazed at the difference in how much easier it is to keep clean afterwards.
I always liked black trucks but I never owned one, it would drive me nuts trying to keep it clean. Yours looks great.