I'll be honest when I say that the map of Tamriel looks an awful lot like the map of Western Europe, which isn't very big. The fact that it only takes tops 10 minutes (fully encumbered) to walk from Riften to the Morrowind border (which is essentially the distance from Bruma to the Skyrim border) means that the scale would have to be humongous for it to take months to get an army from the Imperial City to say Whiterun. In fact, it would take years instead if using traditional map scaling.
For reference, Berlin to Paris is about 650 miles (1,050 km), which easily resembles the path needed to get from say Tel Vos to Chorrol.
Shift the Summerset Isles up
Shift Highrock and Hammerfell east
You essentially have Western Europe, including the boot of Italy in Elsweyr.
Skyrim being the equivalent of Benelux.