I study Isshinryu and I can tell you that you cannot earn a black belt that quickly. You wouldn't even really be "earning" it IMHO. I am a brown belt and have been training for two years, however, I have put in much more training time in the dojo than most but I still have a ways to go to black belt. As we all know, in Karate, Isshinryu or any style of martial arts, your goal should not be one of getting the next belt. Also, we all know there are "McDojos" of black belt mills outs there handing Black belts out left and right. There are 8 empty hand katas and 7 weapons katas as well as three weapons vs katas (bo vs bo, sai vs bo, etc.)