some days my daughter nurses a regular amount of time between 15-20 minutes total. Some feeds she nurses for 40 ish minutes. However there have been a few days where she nurses for less than 10 minutes total each feed and screams bloody murder if I try to get her to latch back on. Should I be worried she isn't eating for long enough? It's not like she is hungry sooner she still goes 3+ hours during the day and her 6+ hour stretch at night.