How long does your baby breastfeed?

Kendall
My daughter is 1 month old and usually bottle fed 4 oz of breast milk. But ive been trying to reintroduce breast feeding (we had to stop because of her latch and my pain). But she always falls asleep while breastfeeding so I never know if she is getting enough. I try to keep her awake, undress her, tickle her, readjust her; she just knocks out after about 10 minutes on both sides. Then she doesnt nap as long afterwards. How long does your little one breastfeed till full?