"In Chicago, for instance, students will spend 38.8 hours on state and districts tests by 8th grade, while in Denver that total will top 159 hours. At the 3rd grade level, differences in testing time could amount to as much as three instructional days: each year in Chicago, children spent five hours on tests, while in Cleveland they spent 25 hours." (EdWeek: Study: Districts Vary Widely in the Amount of Time They Spend on Te...)