If the baby does not come off the breast by himself after 20 to 25 minutes on a side, and you want to switch breasts or rest awhile, you can take him off by first breaking the suction. Even if he is not actively sucking, his hold on the nipple is tremendously strong. To release the suction, pull down on his chin or insert your finger into the corner of his mouth, pushing your finger between his gums until you hear or feel the release. You can also try placing your finger on the corner of the baby's mouth and pulling the skin gently towards his ear. After taking the baby off the breast, leave your bra flaps down so that the air can dry your nipples.
Air drying helps to maintain healthy nipples.