The timeframe differs for each person. The most advisable course of action would be to consult a limb lengthening specialist rather than seeking advice on this platform because the individuals giving you guidance here may not have the same experience as you. Your approach of conducting research and asking relevant questions is commendable. Reviewing older journals, watching limb lengthening videos on YouTube, and scheduling a consultation with a surgeon with a list of prepared inquiries are all recommended steps. It is logical to assume that undergoing a smaller increase in centimeters will lead to reduced discomfort. For instance, opting for a 5 cm extension on the femurs followed by a 3 cm extension on the tibias after a 6-month interval may be a reasonable approach, despite the mental strain of prolonging the process. However, the optimal strategy varies for each patient, which explains the diverse opinions regarding the level of pain associated with this procedure.