Just skimming the replies, so maybe someone already said this, but I am a HORRIBLE pumper and even with overactive let down and over supply and leaky shirts, I just couldn't get pumps to efficiently express for me. I think the sound is like a turn off to my breasts. ANYWAY, I could get the MOST milk out when nursing the kid on one side and pumping on the other at the same time. Having the baby nurse while I pumped made a huge difference, so hopefully you are pumping during the first nursing session you have when you are reunited. This will probably give you more milk than both sessions at work. First nursing in the morning was also a good pumping time for me. Pumping while the baby was gone: Just frustrating, and made me miss my baby. I babysat for a mother who always nursed her baby right away when she came back, and pumped at the same time. Then she left the freshly pumped bottle in my fridge for the next day. It worked really well.