Might take you a couple of hours - but you would only do it once every 6-12 months usually depending on how pedantic you are about your car and its paint, and how your car is kept (i.e. in a garage, undercover, or outside in the elements... )
Seriously worth the time and effort and makes keeping it clean and shiny a whole lot easier between clay bar treatments.
Most of mine are also Autoglym or Meguiar's too.
...which brings me to the point...
Here in Sydney I'm able to organise for PA (and to make up the numbers, Honda guys), a free Meguiar's Night on a week night.
Interested?
I organised one for SAU last Thursday, and Meguiar's is happy to run one for PA.
The Tech Night consists of light refreshments and food (after your work) + demonstration for an hour or two.
At the end of the night, you get a sample bag + 20% off Meguiar's, Liqui Moly & 3M Wrap.
Best Shape Award = 4th Gen Prelude + Best Bang For Your Buck Award = R34 GT-R N1
I hear there are a lot of Car Detailing services in Queensland area.