Can't believe noone's responded to this.
Macquarie gives you the flexibility to fiddle with your timetable as much as you like. Generally, assuming you're doing full time studies of about 12 credit points a semester, you'll be on in about 12-15 hours of face-to-face tutorials/lectures, etc, on average. Add to that any study time, research, assignments, or breaks between classes. Generally, most students seem to fit classes across three days. (Since working in the registrar's department, I've perfected that spiel!)
Re the BBA's content, I'm in the final year of a BBA+BA-Psych. Compared to the psych, I've found the business to be particularly ...contentless. But that's just my impression too, and there'll be plenty of people out there telling you otherwise. (Edit: it's 'contentless' because it's, in my opinion, very general, and doesn't really build up a firm knowledge base for you. see below.)
Beside simply not enjoying your college stuff now, why are you looking at the BBA? Are you considering other (business-related) degrees? The BBA's pretty general: it gives you the options to study some economics, accouting, marketing, HR, org psych, etc... but doesn't make you a specialist in any area (there are separate degrees for all of the above)... Are you looking for a general business degree like that, or is the BBA just another option on your list?
Edit: That said, the flip side of this 'generalness' is that you've got a broader approach to business. This is useful if, say, you were working (as I am) in a small business (or running your own, or other similar situation) that needs bits and pieces of all areas of business, without hiring a specialist.
