Good point that!
I'd postulate that since you are positioning you are on duty. Any time spent going through immigration, waiting at the carousel, collecting your bag and then getting airside again is duty time.
That's the watch out of your operations department? It has to comply with local laws as well as FDT limitations, does it not?
A fine kettle of fish which should afford much hair pulling to those beatific creatures in crewing who cut corners to the margins of the lunatic fringe.
I would reckon, in a nutshell, Brazil or otherwise, that it is not your problem.