Even though I hate to admit it, I have used Nu Finish in the past. Suprisingly, it really does last a long time. I would estimate at least 6 months. It gives a reasonable shine and doesn't require much work to apply or remove. However, most other waxes will give you a better shine. If you are just looking for protection, then it may work for you.
If you have a hard time finding Zaino, I would highly recommend Klasse. Its usually available online. Since its a polymer, it lasts for a very long time. I usually get about 9 months or more before I have to re-apply. Best of all, it gives a GREAT shine.
2008 BMW 535i Space Gray, Black Leather, Dark Bamboo Trim| Sport Automatic with Paddles | Sport Package
2008 BMW M5 (gone, but not forgotten) Space Gray, Silverstone Merino Leather, Madeira Walnut Wood Trim | 7speed SMG | All options
Mods: Corsa Exhaust | RPI Ram Air Intake | H&R Sport Springs | Rogue Engineering 12mm spacers