Sorry Lin the google map didn't work so these are the stops I would do.
Jervis Bay to Canberra - 3.5hrs approx
Canberra to Albury - 4 - 4.5hrs
Albury to Deniliquin(via Rutherglen) - 3 hrs
Deni to Swan Hill - 2.5hrs
Swan Hill to Mildura (stopping off to check out Robinvale) - 2.5 to 3hrs
Mildura to Renmark - 2hrs
Renmark to Murray Bridge - 3hrs
Murray Bridge to Adelaide - 1hr
If they left Jervis Bay tomorrow and stopped one night in each place they would get to Adelaide by the 13th.
Just the way I would love to go but others might have some better ideas.....