Driving Roads / Great Ocean Road

This 240 km coastal route from Torquay to Allansford hugs Victoria's dramatic shoreline past the Twelve Apostles and is also the world's largest war memorial. It runs about 149 miles along B100 in Australia. Drive time: about 4 h 15 min without stops (1-2 days with stops).
Best time to go: Open all year; summer (December to February) is warmest and busiest. Visits to the Twelve Apostles visitor centre need an advance booking.

Sources: Length · Best time. Drive time is the route time for the mapped route without stops, from Mapbox.
A scenic coastal cruise: record each leg and keep the distance and drive time, so the whole coast fills in on your map.
Narrow, winding coastal lanes carry heavy tourist traffic; use turnouts, drive on the left, and slow for the many viewpoints and curves.
Open Road keeps every drive: the route on a map, the time and the distance. On iPhone and Android.