Essentially there is no set timeframe or period between grading’s and belt advancement.
Belts are not awarded on attendance alone, all students are invited to grade based on fundamental skill level, and overall attitude. Belts have to be earned, and a student will only be invited to grade when their chief instructor believes that they are ready to do so.
At the Hakudakan, we believe that belt levels are a direct by-product of the training, commitment and the focus should be on the journey of acquiring new skills. So if you apply yourself and train regularly, you will accelerate the time between gradings.