With my first child, I had to pump 3x a day (12 hour days) for a while in someone else's office, since mine was in the corner of the conference room. Fun, huh? Finally, I got my own office, and that was nice b/c I could pump in there with the door closed between patients. I was doing research, so I scheduled my own day, and I did it around pumping.
Now, I just squeeze it in when I have a minute. My office isn't terribly busy, so I can usually do it. Problem is, pumping is not my favorite thing, so I forget sometimes.