[Perfectlap]

well my car sits in the garage Monday - Friday so its lasts a good while.
At least a month and a half. Probably longer if I applied an acrylic wax over it.
Oddly enough I do the same thing on dress shoes.. I stain the heel and then apply wax over it.
I use the forever black on the trim near the passenger windows too. Those start to fade. Interior plastics don't work at all with the FB. Most be a polypropylene thing.