,----------------+-------+--------+----------.
| Task           | Start | End    | Duration |
+----------------+-------+--------+----------+
| Week first day | Nov 9 | Nov 9  | 1 day    |
+----------------+-------+--------+----------+
| Task 7 days    | Nov 9 | Nov 15 | 7 days   |
+----------------+-------+--------+----------+
| Task 7 days    | Nov 9 | Nov 15 | 7 days   |
`----------------+-------+--------+----------'