The time table is quite nice, actually
It can vary though depending on when your lessons are scheduled for.
With double H+SC and sociology, you would have 9 x 80min lessons per week (6 for HSC, 3 for sociology), plus a tutorial (timetabled for 80min but usually shorter) and a HSC tutorial. Tutorials happen most weeks, but the HSC tutorials are much less regular. The college day is 9-5, however I doubt you would get more than a day or 2 like that, and you would have lesson gaps (i.e. lesson at 9, lesson at 12 and lesson at 3.40). What you do in the lesson gaps is entirely up to you; study, go home, wander around town etc. Doing HSC you will have to do voluntary work, and it is pretty easy to fit it in around these times. Wednesday afternoons are always free, too.
If you want an example, my timetable is
Monday: 9-3:20, with a gap between 12-2
Tuesday: 2-3:20
Wednesday: 9-10:20
Thursday: 9-1
Friday: 10:40-3:20
It's totally different to school in that you don't have to register every morning, your teacher just takes a register at the beginning of class