What is the relationship between instructional time and student achievement—that is, does increasing instructional time increase achievement?
Baker, D. P., Fabrega, R., Galindo, C., & Mishook, J. (2004). Instructional time and national achievement: Cross-national evidence. Prospects 34(3), 311–334.
The findings presented in this book are based on an analysis of 57 research studies concerned with the relationship between one or more of the educational time factors cited above and the student outcomes of achievement and attitudes. Twenty-nine are primary sources (studies or evaluations) and 28 are secondary source (reviews, syntheses, and meta-analyses).
Cotton, K., & Wikelund, K. (1990). Educational time factors. Portland, OR: Northwest Regional Educational Laboratory.