Some questions regarding CLL

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I have some questions regarding CLL:
1. What is the safest length if you are doing bilateraL surgery(1 year gap in between)? Cyborg4life explains 
that it depends from person to person according to their flexibility, how much pain they can endure, etc.
But if one is eligible to go for the full length, the suggestion is 8 cm for femurs and 5 cm for tibia.
What do you think?
2. What are the stretching exercises that will make one more flexible and help to get
the maximum amount lengthened?
3.  How much difference between the wingspan and body will look normal?
4. Does sitting height matter? Wouldn't it look strange if someone with a torso of a 88-90 cm is 178 cm tall? Or that
sitting height varies a lot from person to person even if they are the same height?
5. Who are the best surgeons currently in this field? I have done some research and found that Dr. paley and mahboubian
are great. Are there any others as well that you know of?

Edit Post

Thanks for replying mate! Actually I am neither active in sports right now nor I plan to become a professional athlete, but I agree that we need stay under the safe limit so that we get back to normal in a few months and (almost) fully recover from it, so doing bilateral 13 cm will be good enough(I hope).