I also did the one-sided feedings with my son. This was partly because I had so much milk though, and it helped my body to even out the supply more quickly. However, it is a valid technique, and you do need to make sure that the baby is getting the hindmilk, which has all the good fat in it to help her grow. Try not to watch the clock. Instead, once baby latches, listen for her swallows. Once she either latches off on her own, or goes into just nursing for comfort (not eating, just sucking) then she is done with that breast. You could try offering the other breast if you feel she needs more, or just start with the opposite breast at the next feeding. The first pedi we saw when my son was born told me at least 15-20 min per breast, but that was such generic advice. I did consult with a lactation consultant in my home, and she was much more helpful and gave pertinent advice while being reassuring and supportive. You may want to as well, and get personalized support from a trained professional. On your other point of her seeming to always want to nurse, that's how it usually is in the beginning :) At least it was for me and all my friends who have nursed. Once her tummy gets a little bigger and she can eat more at a time, she'll nurse less often. But the first couple of months you're gonna be pretty tied down. Good luck mama, and congrats on your baby girl!