Ah, not far behind at all then. You just need to finish up Mt. Koltz really. What's next is just a big talk talk talk scene in the Returner's Hideout, so all you need to do is tapping buttons rapidly. If you're on an emulator, you can speed up the process as well.

Definitely shouldn't take you more than an hour to get back to the three way scenario split up I reckon. Just start with Locke's scenario so you get to do something fresh ;D