High school classes are taught by generalist. College classes are taught by specialist. High school classes are daily. A college class could meet two days a week for an hour and a half each day or perhaps an hour a day for three days. Some classes are even independent study where you are given a list of books, articles, or research to read and then make comments about. . I have even had classes in college that met one time a semester and the remainder of the time I was to work on a project.. College homework requires several hours and high school homework could be answering simple questions. The difference is the level of instruction and level of required study. I always kept the project listed on the first page of a spiral notebook with the dates because they may be mentioned only once. That could be a surprise when you realize that much work needs to be done before it is ready. In college you have more time to study. You also are responsible for your management of time.