So I'm guessing this means that we won't be getting a full leg in either North America or Argentina?
Grant said ten legs - if this is a Double-length leg (As I believe it is, because J/M didn't get a prize!), this means next week is Leg 5-2, and we still have five legs (and four more countries) left to watch. I don't think 7 have confirmed a finale date yet!
Based on the history of TAR Aus Season 1, a double-length leg that featured two pit stops is still counted as two legs. I guess we may have the combinations of Siberia-Croatia, Croatia-Portugal, Portugal-North America, and North America-Argentina left as combined into one leg, since nobody have spotted a pit stop in these places. Hopefully it will not be the combination of Portugal-North America (like Season 2 France-Cuba), or North America-Argentina (the worst case scenario).