My advice is that don't ever stay near negative friends. That's what I've did. Whatever they say, it won't bother me. Just make sure you are doing things correct and show them your progress. Then they'll beg for you to teach them and then you'll start to be the hero... or they'll accused you of steroids which is why haters gonna hate but envy is a good sign of you progressing

To answer your question, 2 months for me. But usually the person who hangs around you will need to see much significant changes in order for them to notice compared to person who you rarely hang with.

Anyway, we did this for ourselves, not for others

Would be a year for legs no?