Carolyn Kelley, a professor of educational leadership and policy analysis at UW-Madison, said she?s not aware of any consensus among researchers on what kind of school calendar best meets children?s educational needs.But she doubted that adding a few minutes to each class period would spur changes in teaching methods enough to cover more content. She also pointed to the well-established finding that ?longer breaks are worse for kids,? especially poor or other ?at-risk? students.