The amount of time allocated for learning and the way that time is used is one of the few variables that can be influenced rather directly by school leaders. Fortunately, it is also a variable that has shown consistent links to student performance. Now that schools are focused directly, and in some cases exclusively, on student achievement, there…

Under enormous pressure to prepare students for a successful future--and fearful that standard school hours do not offer enough time to do so--educators, policymakers, and community activists are adding more learning time to children's lives. Twenty-five years ago, the still-resonant report "A Nation at Risk" urged schools to add more time--an…