How long a breastfeeding session lasts depends on a number of factors, including your baby's age and your milk supply. An average feeding session can last anywhere from 10 to 20 minutes, but babies can nurse anywhere from 5 to 45 minutes at a time. Here's a guide to help you figure out how many minutes your baby spends breastfeeding, what changes breastfeeding time, what short and long feedings mean, and when to call your doctor.