If your body and the method you use allow it, yeah. You won’t be able to do it if you go with precice or stryde, since they have a limit set on 8cm.
What method can allow over 8cm lengthening?
The real problem is not the method. (lon, precice, stryde etc.)It is how many cm your body will allow. 8 cm for femur and 5 cm for tibia are ideal values for health. (max values)
Can we lengthen 9cm for femurs ?
An average healthy human being should be able to do 8cm, anything past that requires a lot more physiotherapy and dedication but it is doable. Those who cannot do more than 3cm are just afraid or have extremely low pain tolerance.