At work, you will need to express milk during the times you would normally feed your baby. As a general rule: in the first few months of life, babies need to breastfeed eight to 12 times in 24 hours. As the baby gets older, the number of feeding times may go down.
Expressing milk can take about 10 to 15 minutes. Sometimes it may take longer. Many women use their regular breaks and lunch break to pump. Some women come to work early or stay late to make up the time needed to express milk.