I got an already sprouted apple seed inside a fresh apple. I sowed it in my chili plant container. Now it appeared two trees from one seed.
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I am a bit hesitate to transplant it, I'd like them to grow a bit more. The information I am looking for here are:

When should I transplant it to another containers?
What kind of soil should I use?
How long it will take to get fruits from these plants?

Thanks in advance.
Caelian