I spent a total of 2 years (one year straight, second year over three years) training Hapkido in Seoul Korea under GM Kim. Classes were 6 days a week for three to four hours a class. They were very intense classes of little talk from the students, except grunting, and some talking from GM Kim. We started out with heavy warm ups, then went into kicks, then punches, then defensive moves (locks, take downs, pressure points/etc) already taught, then he would do new teachings if he felt it was time, then more defense, then punches, then kicks, then a "cool down" (which was more like a re-warm up!). If you missed any one day of training you were supposed to stay for a second session of from two to three hours after he let the first group go. We had about 12 students in the class. After those two session (or after the first if no second session) all black belts stayed for another two hours.
I studied Tang Soo Do for one year there, under another GM Kim, under GM Pak (now in CA), and it was a little less intense, but still pretty intense!