How much time is "reasonable"?
The "Break Time for Nursing Mothers" law recognizes that the amount of time it takes to express breast milk is different for every mother.
According to the Business Case for Breastfeeding it usually takes around 15-20 minutes to pump breast milk, plus the time it takes to get and put away your pump from where it will be stored between pumping sessions, travel to your pumping space, set up and clean your supplies, store your milk, and travel back to your work station for a total of about 30 minutes. Pump time may vary for different pump types (single, double, electric, etc). Although uncommon, some women may need additional time.