Oda loves to make long arcs and Egghead was one of those too.
If you count all the fb, etc. it's not that short.
And furthermore the biggest difference is the fact JJK editor is working with Oda since the end of Egghead and ngl, the plot is way faster than what it's used to be.
We pratically saw all the areas of Elbaf or there is something left ? Don't know what else there is to know about this island...