Personally, I chalk it up to Harry having to head back to Proven Guilty, with Bonnie in tow, maybe to ensure that Molly gets taken by the Scarecrow. Harry has to find something or do something, and he goes to use LC, when Bonnie (who has Harry's memories, along with Lash's) realizes that Little Chicago is broken, so Harry spends the time to fix it. This is after he has an emotional reunion with all of his stuff.
If there is time travel, I tend to think it's going to be a "Harry has to ensure the integrity of the timeline" situation, not an "I have to go back and prevent X" thing. He'd probably go on and on about the morality of erasing failures, and how it would be too easy to undo everyone's sacrifices, and how that would undermine the meaning of their lives, et cetera, et cetera.