This review will synthesize the results from publications focused on homework time and academic performance, and estimate the relationship between the two. Our objectives are: (1) to identify the extent of the relationship between homework time and students' academic performance; (2) to analyze the differences in the effectiveness of homework time across genders, grades, subject and regions; and (3) to identify the potential factors that affect homework time, such as academic subject, task difficulty, type of homework, mode of homework, parental involvement, and feedback on homework.