Semester 1 finishes on the 10th of June. There is a 3 week exam period after this, which goes until July 1st. Depending on when you finish your exams is when you start your holidays. Semester 2 starts on 1st August, so you will have at least 1 month holidays, if not more.
Remember, there is a mid session break (Vice Chancellors week) from 25th March to 3rd April and some faculties have an extra week off as well.