I went back to work part-time when DD was 3 weeks old. I work a full day on Mondays, so I express once in the morning, feed bub at lunchtime (either drive home or have her bought to me), then express again in the afternoon. My workplace is pretty good with making allowances for me to express and have flexible breaks and start and finish times. The rest of the week I only work mornings, so I express once during that time. I have a manual pump, which is very easy to use and carry around.