It took me a long time... way longer than the most common estimates you'll see here. (Which, honestly, I feel like some of the expectations set by internet transition timelines really aren't being very realistic.)
I finally first started getting gendered female in unisex clothes around the 13 month mark. I was getting gendered female more or less exclusively, regardless of the clothes I was wearing, by around the 18-month mark. It wasn't until my 2-year mark where I finally started personally feeling comfortable enough to wear unisex clothes in public, because I was confident that I probably couldn't pass as male even if I tried. Now at 3 years I know it to be true, with my boobs and butt and skin texture plus all of the female behavior/mannerisms that I've inherited since transitioning, I'd probably just look like a dyke if I cut my hair short and tried to act "male."
I'm 30, by the way, and started hormones when I was 27.