When is it time to stop lengthening?

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Here is a question that I don't believe many of us have really asked ourselves or have the answer to.  While in the CLL process when is it a good time to stop lengthening? What signs will come from your body?

I know that the safe limit on femur is 5-8cm and Tibia is 4-5cm....but it could even be sooner than this.

Those are just numbers put out there based on the law of averages.   In your opinion...when is it time to consider stopping the lengthening process? What are some signs that we should all consider? 

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Great replies to all.    As i have crossed the 3cm mark; all is still feeling okay to continue; but I'll post about those tell-tell moments where it may seem that the time to discontinue has come. Looking forward to more posts on this subject.