My daughter is 7 yrs. old and started taking instrument lessons at the beginning of school last year at 6 yrs. old. My wife has a musical background and practices with her. My thought is that she should practice about 45-60 mins. My wife has her practicing on some days 3-4 hrs. In addition to that, she constantly yells at her when she makes mistakes. I think 3-4 hrs. of yelling is counterproductive. My daughter starts to cry and doesn't want to practice. I can't blame her. My questions are 1) How long should she be practicing at this age and 2) Should I be concerned about the yelling. Any thoughts would be appreciated.