I'm not sure why you added the ~30 months for ikkyu on the kendo timeline, there. Are you saying after thirty + months German kenshi are guaranteed a shodan, regardless of testing? Because that is the only way that addition is relevant. Otherwise, the date at which one is allowed to test is the only date needed. Of course it takes longer for some people than others, but that would be true at all belts/dan/kyu/geup/poom/ranks-of-whatever-name. Someone might start kendo and then finally get around to grading six years later. Does that mean you should edit your timeline for 6 kyu to "3 ~ 72 months?" I don't think so. I know someone who was shodan for 8 years before testing for nidan. Should the timeline then read: "shodan 1 year - 8 years +" ? Of course not.