You can manage accumulated time.
For example, lesson, study, swimming, etc.
It is said that "For acquiring new skill, you should invest your time.
100 hour investment makes you get common practice.
1000 hour investment makes you useful person.
10000 hour investment makes you master."
By this app, you can manage and save your each accumulated time for acquiring skill.
You can continue your effort looking back your accumulated time record.
About each list item, you can add, delete, edit.