this is the reply i got from the Vietnamese company (member Asiann's doctor)
My name is Thao and I am doctor assistant. To answer your questions:
1. 6 ->7 cm in tibial is a very safe amount to lengthening.
2. For 6 -> 7cm it takes you around 4 months to walk again.
Please view the details caculate below:
* Aftef the first operation to have the frames on, you will need to wait 10 days to start to lengthening.
* With the rate of 0.75mm/day × 94 days ~ 7cm.
* After you have finished your lengthening then you will have to wait 5 days to have the frames removal surgery. Then another 5 days to recover from this surgery and start to walk with your new height.
Assuming you will lengthening maximum 7cm.
The math will be: 10 + 94 + 5 + 5 = 114 days.
If you only want to lengthening 6cm then please minus this result for 10 days = 104 days.
3. After 2 -> 3 years, you will have to come back for nails removal surgery.
4. You will need to be in a good health condition to undergo this surgery.
5. You need to make a deposit of 500 USD for us via Western Union + a front page picture of your passport to make a reservation + the date of your arrival. Please be aware that this fee is included in the total price and is non refunable in case you decide you do not want to do the surgery any more.
If you have more questions, please let me know. It is my pleasure to help international patients.
Best Regards,
Thao.
western union sounds little fishy to me. what do you think guys