If done overseas when exactly can I return to America?

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Hi

My biggest concern is that leg lengthening will cause a career gap on my resume of several months. In this highly competitive job market I don't want this to stop me getting a job. I was going to list "physical injury/healing 6 months" on my resume and labor laws stop employers from probing further but I wanted to know the minimum time I can return to USA so I can begin job hunting/sending out interviews. By the time I get the job, it'll probably be 1-2 months for the interview process so that'll add to healing time. Plus these are typical STEM office jobs with no physical labor so no worries if I have to walk on crutches for the first 2-3 months of my job or even I could negotiate with my job that hires me to give me time off unpaid but keep my employment secure. Just getting my foot in the door ASAP is my worry.

I plan on doing this overseas and somewhere like Europe. I want to do 6.5-7CM internal femurs.

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I will be quitting my job but nowadays career gaps are a big killer. It's not impossible to get another career but this will be me graduating straight from college -> working for 3-4 years in a generic corporation -> taking 6 months off which is seen negatively by companies.