According to CASA's predictions an ATPL flight test should take 2:00 hours at a modest $800 / hour. As part of my day job I needed to develop an ATPL flight test scenario, based on the CASA Flight Examiner's Handbook (and MOS schedule 5). I cannot see a flight test taking less than 4:00 hours for the flight component (use of IPs not allowed), a couple of hours for the knowledge component and an hour for the paper-work.
See page 81:
http://casa.gov.au/wcmswr/_assets/ma...r_handbook.pdf
See page 7:
http://www.comlaw.gov.au/Details/F20...9-358947eec395