When I was working for Telstra I started on a 4 day week. That meant working 10hrs a day Mon-Thurs and having every Friday off :)
It was great as what that really meant was doing **** all for 4 days instead of 5. Plus if you really had to get something done then you would get a Friday overtime day :):)
However by the time I left it dropped to 3 RDOs/month and then to 2. I was only there for about 18 months.

