I may be wrong here, and thinking of the wrong thing, but when i'm finished developing, stopping and fixing, I just set the tank under running water dumping every time its full for about 2 min. I'm "done", when I don't get that faint purple tent to the water anymore. Course, that could be an error on my part. Perhaps I missed what the subject of conversation was?
So I guess my "method" goes something like this: Develop, rinse a time or two, stop, rinse a time or two, and fix, then rinse a lot...

I guess from a chemists point of view, a wait period where the film set in still water would allow the water to "extract" bad stuff until it was saturated, then you would need to dump. Thus, I guess my "wash till the purple is gone" method would conserve water by doing less actual rinses... who knows...