Betzbone while doing studies

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Hello,
I am a French 165 cm 20 years old guy planning on doing the femur Betzbone this July and to lengthen during my first engineering school year (which is a light year).
Idealistically, I wanted to lengthen for about 10 cm.
Do you think it will be possible? I might miss some lessons sometimes but will try to catchup with documents. In case of complete failure I can redo my first year also.
Do you think it is a good idea ? (I cannot have a gap year, otherwise they will reject me)

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By « light year » I mean that I will have around 25~30 hours of lessons each week

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Yes, I’ll probably won’t need to attend all the lessons though so I’ll tell the teachers.
One think I don’t like with the BetzBecker institute is that they are telling me to send a 20k€ deposit in the next 7 days in order to save the 29 July appointment. I feel like giving 7 days to decide is a bit exaggerated cause I will probably need more time to decide.