Seriously, are we talking about managing pain when it comes to limb lengthening?

Don’t be concerned about the discomfort; nothing is more crucial for a man than reaching a human height. If pain is a major concern for you, then reconsider the procedure. Those who have undergone or are considering limb lengthening have already mustered the courage to endure it. The pain should never be too severe, except perhaps in the initial days. Even if it were excruciating pain consistently, it would still be worthwhile. Approach the surgery with determination and commitment to accomplish it. Avoid overanalyzing the situation.

8cm long femurs and managed okay. I would repeat the process. Your mileage may vary.