Hobart to Queeny is 2 1/2 to 3 hrs cruzin, road is in good condition but is windy, Queeny to Strahan is 1/2 to 3/4 hrs also windy, Strahan to Devonport via Zeehan is again 2 1/2 to 3 hrs cruzin, road again is in good condition and not as windy as Hobart to Queeny.
Hope this helps, all in all good roads scoot a Skyline along!