I don’t think it takes time. I don’t think it’s something you discover over the course of getting past all of the layers of a stranger.
I think you see someone walk into your space, your world, and you see a soul instead of the physical casing you usually see when strangers approach. You see hopes, fears, dreams. You see someone that you used to know, still do.
I don’t think it takes a lifetime to know because you’ve already known each other for so many other lifetimes.
I don’t think you have to employ fancy equations of guessing games X moments trying to figure each other out. I think the universe already figured it out for you. For us.