Most auto manufacturers paint the car and then put the car into a great big oven. This process not only dries the paint quicker for the manufacturer, but also makes the paint stronger. (not sure if stronger is the best word) This is why in most cases the original paint is better then what you can get through a body shop.
As far as how long you have to wait, before the paint cures, I would be really surprised if you were to get your hands on a car within thirty days of painting. Think about it, even if you special ordered your car, the time line would go something likes this:
The main body parts are assembled.
During that process the car is painted (Time 0)
The car is then unassembled into multiple parts. (Ask if you want details.)
Then the majority of the inner parts of the car are installed
It rolls off the assembly line (Time Day 1)
Final inspection/Prep to send (Time Day 2)
Put on a truck to ship out (Time Day 8)
Vehicle goes to selling lot (Time Day 11)
Dealer processes vehicle (Time Day 13)
Customer takes possession of vehicle (Time Day 15)
So I would guess that even if everything went really smoothly, then at minimum 15 days would pass by the time you took possession of the vehicle. This is never the case because the auto industry is to heavily unionized. And of course this takes into account that the auto was built here in the US. If it was built overseas, then just the boat ride over would eat up most if not all of the thirty days. Not to get to far off subject, but if you ever want to see what great lengths companies will go to evade taxes, then this is a perfect example. There are huge, complex models that show the best way of shipping these cars. Ships will carry these cars to multiple ports throughout the world just to avoid taxes. Remember though that both domestic and foreign cars are made overseas and both domestic and foreign cars are made domestically. Bottom line is that because of the oven baking process and time to possession, I would not worry about the paint unless under very special circumstances.
As far as care of the new paint, I would suggest as others have. Maybe clay and then Dawn wash, but anything more then that I would think is unnecessary. I am not familar with what the dealer uses, but I would imagine that the dawn would strip it from the paint without any problems. It probably is some type of cheap quick detailer. Sprayed on with a diluted water solution and then wipe dry. At least this what I have seen done on most dealer lots.
What I would be most concerned about is what you do going forward. Since you are on this forum I would imagine you will be washing your car on a regular basis. Make sure you wash correctly and minimize the tinny spider webs. Especially on a black paint job. As they say, "An ounce of prevention is worth a pound of cure."