I think its weird that all the indside sets are on a different location to the out door ones. So if in one episode The character is inside and outside they may have to do it in different days or times. They have to get their costume exactly right as on tv its in the saem day(if ya get me) ive noticed a few times that costumes have been slightly different in different scens, they'll wear one thing indoors and one thing inside. Ive only ever noticed tiny things like hair bands or make up ect.
I would imagine that the hours they work depends on the storyline ect. Some one like Tracey-Ann would be in more times and longer than Shane (at the minute) but then it could change when the stories do.