John Riggs wrote:
Testing is generally to yondan with the aikikai and then after that it is by recommendation. If I recall you are looking at a minimum of 60 months after yondan and may be limited to having your own dojo.
There's actually no time or dojo requirements for godan and up, all you need is to have the promotion approved by doshu (although 60 months or more sounds about right in most cases). Even in the lower ranks the "regulations" are more guidelines than anything else - a word from the right person waives most requirements.