According to the FAQ, the circumference of the flat earth is 78,000 miles. That means it would take 78,000 miles of travel distance to completely circumnavigate the icewall and end up where you started.
The coastline of Antarctica, which is actually this icewall, is about 11,000 miles in coastline. Why does it only take 11,000 miles to totally circumnavigate Antarctica and end up where you started, when it should take 78,000?
There would be quite a noticeable time difference in travelling 11,000 miles compared to 78,000.