What's the most height I can gain with two surgeries?

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I'm currently 5'5 (165cm) and 18 years old (still in 11th grade due to getting held back in the eighth grade) My only motivation to do good in school is that I might be able to get a good paying job in cyber security or something else tech related to eventually safe up for LL. Basically my question is, if I had enough money to afford two surgeries, what's the max total lengthening someone could get? Is it different for each person? I read that gaining 8cm in the first surgery on the femur and then another 8cm in the second surgery on the tibiae was possible but I've only seen people gaining 3-4inches here. I've even seen a little person gain a whole 12 inches but I'm guessing that it's easier for little people to gain more. Thanks in advance.

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Do you know if there's anything I can do to increase how much my tissue can handle for when I get the surgery? If so, would it allow me to gain a few more centimeters or would it just make the process less painful? Thanks for the answer by the way