Board Thread:Theories and Speculation/@comment-30241447-20170503042327/@comment-734582-20170516193836

QuakingStar wrote: Itachi was too busy while in Konoha, he was swamped with missions and had to have had Susanoo to use the two spiritual weapons. So he def got it after he left Konoha. I think that's very likely, and his time with Akatsuki would've given him plenty of time and opportunity to go run around and find that weapon.

I don't know, is there any timeline for when he met Kisame, as well as his early days? It could give us some indication for when he should've/could've had it. Seems to me that he couldn't have gotten it that recently (meaning past 3 years) since that was the period where Akatsuki was busiest accumulating information, resources and then Biju.