The 150 km stretch in Brazil towards Fr G is good when dry and even some rain but I also have had a hard time during heavy rains (which are not uncummon either in that area...) and had to wait for several days, cars and trucks got stuck in the thick red clay. Same for the road from Georgetown to Lethem, some stretches are without gravel and the clay can make it difficult after heavy rains. I hit heavy rains twice in the may june period. The road from Boa Vista to Venezuela is asphalt.
It is no problem to enter more then once in Brasil, the counting of the 90 day period will stop when leaving and start again when entering again. Often you will get a whole new 90 day period at every entry...
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