Barbara arrives in Sydney on Monday and wants to go up to tip of Cape York. Will throw her out at Cairns to fly to Sydney so she she can catch flight back to UK (Back to work for her to keep me in the manner I have becomed accustomed to!

)
So what is a reasonable time scale to do trip (via Old Tele Road)?
Have been told not to follow coast line up due to holiday makers on coast road.
Any suggestions on route from Sydney and time scale?
IF push come to shove what is a reasonable quick time from tip of Cape York to Cairns? (Don't want her missing her flight!)
Regards
Brendan