There is no set time per country. They are all quite different. For our next trip, I promised the family a leisurely vacation (for once). We will go to Epcot over the course of 2 days. The first day we will start our way around World Showcase at 12:30 or so, and plan to make it halfway, (or a bit more) around the circuit by the time of our 7:20 ADR. So that would be about 6 hours for half the counties, (including the American Pavilion and its rather long show). On our second day at Epcot, we will arrive at 10:30 or so; use our FPs in Future World, and head to WS around 1:30 or so, and do the rest of the countries from then until our 7:00 ADR. So that would be another 5 or so hours. Also, Flower/Food and Garden will be taking place, so that will slow down our pace from what it normally is. But all tolled, we are talking about 11-12 hours.