Fuzion, less than a week after application-
I also have a comparison, my swirl-free maintained A4 vs my Dad's swirled-out, "Guinny pig for my new products", Toyota Camry. Both have Auto Glym HD. My Audi is the same coat (maintained with FK 425) from my thread
http://www.autogeekonline.net/forum/auto-detailing-101/24234-water-sheeting.html, over 2 months ago. The Camry's wax is less than half that old but not maintained at all, but it's beading wasn't even good next day after application due to such a poorly prepped surface.
All four photos were taken within minutes of each other, just after both cars were rained on. Both cars were washed with DP Xtreme Foam via Foam Cannon plus hand wash with LC grout sponges, each within 4 days of pics.
A4-
Not tight enough, time for a new coat.
Camry-
Polished panel, but this car goes through "auto swirl machines"
As you can see, the highly polished car shows decent beading even 2 months after application. Far superior to the poor beading of the un-maintained surface of the Camry, even shortly after application.