Hi Breminator98.
Most people that I know, or have heard of, plan for at least one decent sleep of 6 hours or so.
If you are planning for a 48hr trip then I'd definitely plan for a decent rest.
On one attempt we went anticlockwise and slept at Whalania Creek.
On another rained out attempt we went clockwise and were aiming to sleep on top of Paralyser.
Check out
http://3pktg.blogspot.com/I guess I'd also be listening pretty closely to what Dave Noble says.
(In all the log books out there, there are two reoccuring names, 'Noble' and 'Bourke'.)
Good luck,
Melinda