Is your daughter gaining weight appropriately? Is it possible that your supply is low? In the first few weeks, I thought my daughter was "cluster feeding" because she fed for 2-3 hours straight, with only small, 10-20 minute cat naps in between latches. At 2 weeks, she hadn't regained her weight and we found out that she was tongue tied and I had low supply as a result of her poor latch. Just a thought.