Hi georgiyzhukov
Certainly, you haven't done enough research about LL. This is an extremely challenging and demanding procedure. You need to do enough research before you do CLL. But, I can tell you a little bit as far as I know.
10cm in tibia is absolutely impossible by any methods!!! 5-6cm is a safe range and 7-8cm is a max for tibia, which I don't even recommend anyone.
Lengthening rate is NOT 1mm per day for tibia even for young people. Age is not that much a matter, as far as lengthening rate goes. In general, it is 0.75mm per day. Even with that speed, you have to or will reduce the lengthening rate after some point, like 3-4 cm due to too much stretches of your muscles, tissues, and nerves.
With 5-6 cm goal of lengthening, you need to expect at least 3 months of full time for lengthening. Perhaps 4-5 months are more realistic.