You can reach a height of around 1.72 meters by undergoing a single limb lengthening procedure or 1.80 meters by lengthening both segments if you exert significant effort. However, pushing the limits with two LLs poses significant risks. Lengthening by 12cm in a single segment is considered extreme and is typically only pursued by individuals with unrealistic goals or by those who may not have the best intentions. It is important to stay practical and realistic in pursuing your height goals.