How Long Does It Take for Every Single Eyebrow Hair to Surface?

I had an electrologist remove over 1/3 of my brows without my permission. It's been 10 months since then and I have sparse regrowth and bald areas in the treated areas. Is that all the hair that will ever grow back, or is it possible that more will grow in the future? How long do I have to wait to know for sure?

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