You can see the Total Length of Study Time for each user by following the steps below.
1. On Home screen, select "Confirm attend history" and click "Card Unit" from "By Student" pull down menu.
2. On "By card unit of the student" page, click "Export History" and download a CSV file.
3. You can see the Total Length of Study Time in horizontal axis on the file.
If study time is over 1 hour or under 1 second for one card, the study time do not be included in Total Length of Study Time and be shown as "0:00:00".