Mathew McDowell wrote:
my intention was to say rather "perform with absolute self confidence and knowledge that you have absorbed this level in total".
Even I only train twice a week, I do some type of solo forms (shiho-nage, kote-gaeshi, ikkyo, irimi-nage ...) every day to enforce my body memory.
It give me confidence to perform with uke in class. And I can pay more attention to uke instead of remembering my steps. Since I can do a move consistently (right or wrong), Sensei can pick up my mistake easily.
If you only do Aikido in class, I don't think it's enough.