Quote:
Robert Cowham wrote:
Minor quibble - Aikikai grading criteria are minimum 1 year to nidan, 2 to sandan and 3 to yondan, but with practice days requirements as well:
http://www.aikikai.or.jp/eng/gradingsystem.htm
Your stated minimum are the more practical levels.
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I know. That's the Hombu minimum, extracted from a dojo with bundles of high grade teachers and practice five times a day. In such a dojo, this quick advancement is possible (although still not recommendable, in my personal view).
The periods between dan grades that I listed are, as you say, common practice - not only in aikido outside Japan, but in other budo as well.
Also, I kind of like the mathematical symmetry of it - sort of like a question in an IQ test