It began in level 5, all of a sudden wanikani became HARD. 200+ reviews, trying to figure out which verb is transitive/intransitive, not knowing how to schedule items for my convenience, brain still not comfortable with seeing kanji. Making it past these levels was hard on both of my attempts, but after I crossed level 10, something in my brain snapped and all of a sudden it was easy(er).
Edit: Probably not a coincidence that I read this around level 10
