I don't know that our front ones have "integrated" but it sure feels like we are in process of integrating. Time seems so long these days. Weekends go on forever instead of disappearing in a blink. We are often very self-confused... when we talk about another front one in therapy we get confused about saying "her" or "she" as it feels like self. We now often feel like we don't know who we are, whereas we used to be quite certain of our individual selves, and each knew quite well what was our individual "me" and what was "other". Our memories are mushed - what used to belonged to "other" now feels like mine.
It's all very weird and slow and confusing.