Not every baby needs 15 minutes per side. Some babies take a full feeding in only a few minutes, and from just one breast per feeding. Other babies may feed for a few minutes off each side. Older, more distractible babies are efficient eaters with more important things to do than state at your chest. They may graze at the boob a few minutes at a time or want to go back and forth from side to side.
In general, you know baby is getting enough breast milk when you have a pain free latch where the nipple goes in and out of baby’s mouth the same shape. You can hear baby swallow and don’t need to keep them awake at the breast for them to continue feeding. Baby should be making lots of heavy wet diapers and pooping daily or every other day. They also gain weight to their own curve and are a similar size of your unique family genetics.
If your baby typically latches for you, and feeds well, and refuses to latch, they most likely are done. Follow your baby’s lead and get to know their feeding habits. Trust your baby and trust your body. If you’re concerned about how your baby is feeding, schedule and appointment with a breastfeeding expert: an IBCLC lactation consultant.