,------------------+-------+-------+----------.
| Task             | Start | End   | Duration |
+------------------+-------+-------+----------+
| Prototype design | Day 1 | Day 3 | 3 days   |
+------------------+-------+-------+----------+
| Test prototype   | Day 4 | Day 7 | 4 days   |
`------------------+-------+-------+----------'