It depends on your definition of "get through". We always walk all the way around, so we pass through at look at each country. We'll do the rides in Mexico and Norway and stop for whatever outdoor shows are going on (Morocco- bellydancer, China-acrobats, etc). We go in May during the F&G Festival, so we also like to look at the plants and stop at some of the playgrounds.
If you mean watch the films, explore every area and the stores, go to the Kidcot station, do the Kim Possible thing, try some food, listen to music/watch a live show in each country than it could take quite a while.
We always park hop and go to Epcot for part of the day (morning or afternoon) at least half of the days of our trip. We enjoy Epcot and it was my family's favorite park when I was a kid. This year my kids were 10, 5, and almost 3.