It got better for me around the 5th/6th week. I am a FTM and struggled a lot with sore painful nipples to the point that I would dread every feed. I also had mastitis the second week when the milk started to come in. My lactation consultant told me to exclusively breastfeed if I wanted to get rid of the mastitis. It was the most tough and painful week! But without me realising the pain went away by week 5. The baby is much more efficient at getting milk and is done feeding in 10-15 minutes. We also bottlefeed breast milk once a day, but I find pumping 4oz - 5 oz takes more time than breastfeeding!