How do you breast pump at work!

How do you pump do you pump every two hours or three how do you excuse yourself and find somewhere private to pump? Will work allow you to pump 20 to 35minutes?

What laws are in place concerning pumping breast feeding at work?

How do you find a power outlet for electronic breastfeeding

Whether it's working at Wal-Mart or Lawyer and retail jobs or call jobs insurance etc.