Usually, the Intensive 20 course takes place from 09:00 until 12:15 with a 15-minute break in between and the Intensive 30 takes place from 09:00 until 14:00 - with two 15-minute breaks.
Usually, the group courses start at 09 AM. However, the time depends on the number of students in your group.
Please note that the teaching time will be reduced if there are less than 3 students in one class.