Yes, sometimes she can get a good grip and 10-20 min on one breast is what she normally does. She will usually decline the second breast but not always. But I would say only 1 feeding a day is this way. The others are 3 minutes of this kind of sucking then she releases. I latch her on again and again until we get 15-20 minutes of sucking or she tires out, whichever is first. I will say I have gotten frustrated to the point of letting her attach incorrectly even though it makes me a little sore just so she is't so frustrated.
Also I have found that she will latch on better if I let her go longer between meals. All the literature says 2-3 hours but if I wait 3-4 hours I don't have to fight with her so much and she is much more eager to eat, opens her mouth wider, and sucks longer. I just started letting her go this long because she has been gaining weight so well. I hope I don't mess that up.