Where in story..

[Edellis]

You'll know when you're reaching the end. Your feel-o-meter will start acting up.

It may be different doing it all at once, but the more recent story quests don't seem all that drawn-out. There's filler, but alot less of it than the main scenario had, considering EXP is no longer a factor.

Not to mention, each story update patch came with new dungeons and likely primals, all of which drop better gear and are better designed (IMO) than the iterations that came before it. So it shouldn't feel like a grind.