There's a route planner for the GOR here:
Route planner, Victoria, Australia
We did it about 3 years ago in my XR5 as part of our "Half way round Australia drive". We did from Ballarat to Mount Gambier in about 10 hours if my memory serves me correctly via the GOR including a well timed stop at the 12 Apostles just on sunset as well as a couple of other short stops along the way. There are some truely great driving roads in that area (in fact there are several great roads in the areas between Brisbane - Hobart- Adelaide - Brisbane). If I did it again I would probably do it a bit more lazily and spend the entire day doing the shorter part of the trip but stop at a few more places along the way. I noticed I seemed to "catch up " to slower traffic even without speeding and I think more frequent stops would have made the shorter driving stints in between even more enjoyable by allowing more open road. We went in July and surprisingly saw very few Police but I was told by a local that during holiday periods the road can be very heavily patrolled.
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