Re: Is two Days a week enough?
I have the solution :-).
Eliminate Black belts and replace with Merit badges that you sew on your gi. Just like the scouts. One badge for ikkyo, one for nikyo, one for sankyo, etc, one for each weapons kata and so on. Aikidoka collect them based on a single examination for each technique. A person who trains 2 days a week may focus on only a subset of techniques and gain his "black" merit badges in the same time as the 3 day a week person gets his "expanded curriculum" badge set.
Eventually the 2-dayer will accumulate the same number of badges as the 3-dayer. That way you truly judge each student on his ability to perform specific techniques.
It would make for a colorful dojo!