A new concept explained in class might seem foreign at first.According to child and adolescent family therapist Darby Fox, yes. There is a point to homework and the right amount really is age appropriate," Fox said Friday on "CBS This Morning." Elementary school students have an average of around 4.5 hours of homework a week, while high schoolers get an average of about 7.5 hours, according to the Wall Street Journal and Department of Education.The National Institute of Mental Health says more than 30 percent of teenagers experience some kind of anxiety, and homework is a major contributing factor."As we get older, fourth grade, you can have 45 minutes, an hour – up in through high school, 2.5 hours is appropriate, 3 hours.But schools have really taken it way too far."She blamed the "race to get amazing resumes, the best test scores.""But that has escalated almost directly with mental health problems, anxiety, depression," Fox said.Bringing homework home, completing it correctly, and turning it in promptly teaches a host of other important life skills, from time management and .Despite these benefits found by researchers, the topics of who should receive homework and how much homework are hotly debated among educators and researchers. Heffernan is a professor of computer science and director of the Learning Sciences and Technologies Program at Worcester Polytechnic Institute.He is the developer of ASSISTments, a free web-hosted digital platform that provides teachers with specific insight into their students’ progress on math homework.That depends upon many complex factors, including the individual abilities of the child, other demands upon time, such as sports, part-time jobs, family responsibilities, and types of classes.Are schools across the country going too far by banning homework?