,------------------+--------+--------+----------.
| Task             | Start  | End    | Duration |
+------------------+--------+--------+----------+
| P_start          | Jul 1  | Jul 1  | 1 day    |
+------------------+--------+--------+----------+
| P_end            | Jul 10 | Jul 10 | 1 day    |
+------------------+--------+--------+----------+
| Prototype design | Jul 1  | Jul 10 | 10 days  |
+------------------+--------+--------+----------+
| Build prototype  | Jul 11 | Jul 17 | 7 days   |
`------------------+--------+--------+----------'