actually zaino IS a pretty good wax for the lazy. you invest a lot of time at the start, but the sealant lasts a very long time. i use Klasse AIO + SG (one more step than you are looking to do), and it stays nice for a good 2-3 months depending on the weather and how much the car sits outside.
carnauba wax starts to wear off after a couple of weeks, so you'll be doing it more often than every couple of months.
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