I think about 2 meters :borg:
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Before I got my Nakayama from O_S I tried to pin him down to give me an estimate of the stone I was getting. His response was exactly what you were saying and he would not even make an attempt to relate it other stones and their respective grits either. I know some people are usng their Nakayamas as finishing stones, but to be honest, I think that is in some ways an insult to the potential of the Nakayama. I have found that they are almost finishing system in and of themselves. From what I understand, they are all different fromach other so this may not be an accurate assesment.
I could not believe the speed the Nakayama takes a hard blade from DMT scratches to finish. For me there is much to learn about them and what they can do.I hope you have fun with yours too!
You are indeed correct that they can be quick cutters. I'm not sure which DMT you are referring to, but I've gone from a BBW and a DT straight to my Asagi and got fantastic results. The BBW and DT give about the same finish (I couldn't tell them apart in a blind shave test) and I have seen them estimated at 6-8k.