If it's done properly it will take about a week or longer. Depending on what work needs done on them
You can probably get it done overnight if you go the dodgy road, as in not stripping the paint off and having it rubbed back, not having the entire wheel painted and making any repairs with bog...
Mine took 9 working days to be completed. That included stripping back to bare metal, repairing any chips or gutter rash (I had hardly any) and coating.
I suggest you take your time and find a place that does it properly. I'm not so sure that you will find better value for money than the work Craig does and has offered to us all at a discounted price!
looks like i'm going back to steelies for a while... and sending my rims down to melbourne...
unless anyone knows a place in sydney?