So I have completed training Disco to 120. From 105 it slowed down quite a bit, but it made it. I am guessing that it took something around 25 hours to go from 105 to 120. I suspect that it would have been a great deal quicker if I did not have 120 music.
Script is definitely a lot safer to use than the method I was using, which was to tame a bunch of animals and keep them trapped while I worked it, or the work on the meers. Although it is slow, it is not so much slower either. Because of the added security of being able to train pretty much anywhere safely, this is going to be my preferred method.
I saw no bugs during the run, script ran like a champ.
It doesn't seem to have a check to stop at your skill cap, or a check for when you have run out of instruments. Both might be nice to add.