Wow, this is a lot to take in at first glance, but I'm definitely interested in this RP. A quick bit of math tells me that the total land area of the continents is about 600,000 - 15,000,000 miles (Or 965,000 - 2,414,000km for us superior international types). The low estimate represents a land area roughly the size of spain and Portugal combined, while the higher one is a bit larger than Scandinavia. Just to give an idea of scale here.

(Why did I just compute all that? Because, I tell you, because)