Most jujitsu is based in practical techniques,not katas, you then learn variations on techniques to enable yourself to adapt to different situations in combat. Our sessions are usually about 1.5-2 hours in length with about 30 minutes of that being devoted to the 'body conditioning' part of the training. Belt progression (at least in DanzanRyu Jujitsu) is based soley on how quickly your body develops and how quickly your mind is able to absorb the techniques. You may not gain belts as often as you would in Karate, but you will definitely be gaining 'real world' effectiveness. Most of the techniques you learn even at the very beginning of your training are designed to cripple. Jujitsu also gets into weapon defense quite a bit which is a lot of fun, I hope you enjoy it.