I have not had to reapply any TC since the first time. All I do is wash it, and use some TC-5 detail spray to bring the shine all the way back. I will try to find some Zaino pics I took when I was hooked on that stuff so that you can see the diff.
Here are some pics of the car with Zaino. The shine was not nearly as deep, and it had a silvery look to it when the sun hit it when you looked at it in person.
You can really see the difference. On black it looks like the car has 8 inches of clearcoat on it, it is so deep looking. The Tropi-care pics as well as the Zaino pics are the products alone. I didn't use any topper, and they were both applied by hand.