As the Kumon Method is an individualized learning system, the pace of learning and the achievement of the mastery level will differ among students. However, we assume the following standards:
1) If this is your first attempt at learning Japanese,
the worksheets in English have 15 levels, from the easy 4A to the final level. By studying 10 sheets a day (for 30 minutes to one hour), you will complete up to Level F (beginners' level) in approximately one and a half years and reach the final level in about two years.
2) If you have some experience studying Japanese,
you will start from somewhere in these 15 levels. Then the time required for your completion will depend on this starting level.