Largest intial lengthening?

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The last years I realize that I only need 3-3,5 cm. But i also want to be quick about it and dont risk to much original ability. So now the last days I read the thread about instant lengthening that was 2-3 cm instant. Whats the largest instant that is possible to do without injuring the nerves, tendons and muscles? If you do alot of stretching and maybe some yoga before it may help?
And does how the bone is broken also important? Was thinking that a clean cut stright over is worse than if its broken like u naturally would broken the bone. The right is the naturally broken bone.
http://postimg.org/image/pakkli0l1/
Must be faster to heal if he bone to the right is broken and pulled apart right?
Maybe do a 1,5 cm on each segment to get less risk and better proportions.

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It would make a differ to me, it would get me in the average range so ofc it makes difference. To get back to 100% is important, and honsetly, the cost should not be much more than a regular lengthening?