i agree with the others .. it will probably be really hard. I also wonder if there's a law that your employer will have to abide to??
Try looking here -
Breastfeeding State Laws
I also agree that reverse cycling could be an option but you'll probably have to set it up several weeks in advance ... and it could muck up your BF'ing on weekends and overnight.
How do you commute? do you drive? Many ladies here have hands-free bras and pump in the car. If it means the difference between 9 hours between pumps or 7 then it could make all the difference,
I hope that helps a little?