Feedings will take about the same amount of time regardless of the method used. Babies need to eat frequently because they are growing so quickly. Feeding times should always be a time for close, nurturing contact. Always, always respond to the baby's cues for when and how much she needs to eat. Also learn to hand-express.
Many inexpensive pumps are weak, uncomfortable, or ineffective.
Do not allow milk to remain in the breast for more than 6 hours at any time, because the retained milk will signal the cells to slow down production. Double pumping cuts total time but does not speed up the rate of release of milk. Each woman is different. Breast storage capacity differs, too, and may be somewhat related to size. A small-breasted woman may need to pump more often than a woman with more glandular tissue and more storage capacity.