Re: How does Aikido compare to Aiki-Jujutsu?
I can only speak for the dojo where I train.
Our classes take 90 minutes. The warming up is light, it's actually more loosening and activating the body than warming up. But we move a lot and ukemi in particular quickly warms up the body. So most of us will sweat, even when the weather is cold. My gi is usually soaked when class is over.
Randori may not mean the same thing in different styles and dojos. In our dojo randori means multiple attackers. There is also jiyuwaza (freestyle), which in our dojo means that nage has some freedom of choice about which technique to apply. Sometimes we train with uke having some freedom of choice about his attack (I don't know if that kind of training has a name).
In our dojo it depends on the teacher and the amount of space on the mat and the composition of the class how often we do this kind of training. I train two times a week and about once or twice a month we train multiple attackers and / or freestyle techniques and / or freestyle attacks for about 15 minutes near the end of a class. Lower rank students also participate, but I don't think we do it with novice students.
Anyway, I really enjoy the the extra intensity of this kind of training and I wish we'd do it more often.