Well for Accounting we were were required to do Chapters 1&2 for holiday homework after a week of Year 12 classes at the end of Year 11.
Business management we did 1.1, 1.2 1.3 and 1.4... all before the year started. But then we went quickly through it in a period when we got back.
I think they try and give us extra time for exam revision or enough extra time so that we don't fall behind later in the year and rush to finish the course. We also went on Year 12 retreat which meant we missed out on 3 days of school plus we've missed heaps of other days of school because of special celebrations (its my schools 50th year)!
Really though... a lot of the Business course is pretty common sense so you don't need to spend HEAPS of class time clearing up things.
Also with Accounting we are finished Chapter 10 and starting Chapter 11 when we get back to school.