Mindfree, I don't agree with your 5 days/week assumption.
1. The numbers mentioned by Orbite have always been in the range of 350 days/year.
2. Smelters, Paper cies, etc... work 7 days/week. It's often not practical, and sometimes very costly, to stop everything for 2 days, mainly because of "shut down" and "start-up" operations. A schedule acceptable to everyone will be designed.
We'll know pretty soon.