Just got back from a great class training for a nice warmup, lots of drilling, 30 minutes nonstop 5 min rounds, and then circuit training at the end. I have never been the best example as a model student, and have missed many of classes for all sorts of reasons. The bottom line is the after class euphoria you get when you give it 110% at practice is the best feeling ever.
We have guys that come late, or leave before its time to roll, but not rolling and doing solid work is cutting yourself short. I have come to the realization that unless you give it 110% in each class, you are selling yourself way short. This also carries on to life, but that story is for another day.