To Whom It May Concern, I apologise for the late reply, though it's a reply, nonetheless.
All phases of an EI will evolve at the same rate, though with considerable "lag" between them, per se. If the first generation of the item was released eight months ago, with it evolving once every month, then the eighth generation would be eight months behind, requiring eight more months to be at the stage of the current generation. One new generation will be released as the first evolves, so, as is accordingly, if it has evolved some ten times, then there should be ten generations of it, including the first, each evolving at the same pace. Once the first generation item has fully evolved, Gaia will stop releasing further generations, and will then simply allow the already existent ones to finish their metamorphosis.
I am unaware of what the time frame between evolutions for Aria Dannata is, however that was an example of how the evolution of varying generations occurs.
It was daylight when you woke up in your ditch. You looked up at your sky then. That made blue be your color. You had your knife there with you, too.
When you stood up there was goo all over your clothes. Your hands were sticky. You wiped them on your grass, so now your color was green.
Oh Lord, why did everything always have to keep changing like this? You were already getting nervous again.
Your head hurt and it rang when you stood up. Your head was almost empty. It always hurt you when you woke up like this.
You crawled up out of your ditch onto your gravel road and began to walk, waiting for the rest of your mind to come back to you.
"If God is our Father," you thought, "then Satan must be our cousin." Why didn't anyone else understand these important things?
You can see the car parked far down the road and you walked toward it. You got to your car and tried all the doors. They were locked.
It was a red car and it was new. There was an expensive leather camera case laying on the seat.
Out across your field, you could see two tiny people walking by your woods. You began to walk towards them.
Now red was your color and, of course, those little people out there were yours, too.