I have a five period day, and a ten day cycle. So here goes...
1) I should get 8 for doing a uni enhancement (as replacement for the 5th vce subject I didn't do), 2 for not doing sport in year 12, and anything that's left over (my count is 3), which adds up to 13 periods; but I'm not too sure how many I will get (my school is too hard to predict). I'll let you know on my first day friday (we don't have a fancy intranet
yet, so I see my timetable when I rock up in the morning)

2) ~60 mins depending on the day.
3) I cannot come in later, but I am able to leave early
4) Basically, I have to stay on campus unless I have no other subjects on that day. If I have to stay on campus, I have to go to the library or the assigned room as per my timetable.
5) As per 1), I should have 8 per subject. 8 periods * 5 subjects = 40 periods; 40 periods + 2 sport (I get to go home so they're frees) + 1 Personal Development + 4 RE + 3 leftover = 50 periods
Also, my assemblies occur outside of the timetable, in a special period after period 4 and before lunch for 20 mins once a week...