,------------------+--------+--------+----------.
| Task             | Start  | End    | Duration |
+------------------+--------+--------+----------+
| Prototype design | Day 1  | Day 15 | 15 days  |
+------------------+--------+--------+----------+
| Test prototype   | Day 1  | Day 10 | 10 days  |
+------------------+--------+--------+----------+
| T2 (5 days)      | Day 11 | Day 15 | 5 days   |
`------------------+--------+--------+----------'