I suspect it would- just elongated. It does not have the “epic” vibe as the Odyssey, Iliad, or the Aeneid, Nor like the more recent Lord of the Rings. but it does feature some mythical creatures and has a really long story.
But as a work, it was intended to be written for a younger audience, with “okay” writing (and certainly not written in verse) and reads like many “melancholic teen is actually special” motif that we had for many years now. So it seems more “fairy-taleish”, i.e. some low-fantasy with high magic. Its length is something regularly employed in many modern books, even if they could (and should) be distilled to only one or a few. But the length might rather be the publishers fault rather than the writer’s.
Which then begs the question- is The Wind in the Willows a fable?