I am also searching for the answer to this! I am under the impression that any week that is equivelant to full time employment, weekends will be counted.
I I called the immi guys the other day and spoke to 4 people, one was about 90% sure, the other two didn't have a clue and the third seemed to agree, however, she was very short and uninterested and I'm not 100% sure she understood the question!