I've gone the quick route and grease spots showed up each time. I'm peculiar in that I want no grease floating after a two week soak. I soak until that happens. But if you're happy with it, by all means, rock on.
Regarding re-soaking in dawn after peroxide, later on down the road, absolutely you can. Peroxide does nothing to trap the grease in. I soaked old euros that had been simmered, back before I knew better, and it was pretty darn effective.
