Yes, they are. Students are expected to be on time and prepared for each class. The typical workload (for major subject classes) is 3-4 class hours a day, five days a week, for 3-4 weeks, i.e. 45-80 hours. The workload for other academic courses varies. Optional elective courses run from 2-2.5 hours three days a week. For more specific information on each summer program please refer to the web page of the program you are interested in.