I'm in the same boat, I'm 15+ months into HRT and so far so good. I work around 90-95% males that all exhibit the usual male pecking order and testosterone driven ego. However none of the men at my job have noticed or said anything. I know that it isn't because they're being polite or nice, I don't work with those type of guys that wouldn't say anything, no joke or comment would be considered "going overboard or too mean" so anything considered as intended comedy is fair game. A female coworker that I'm sorta close to did make a comment in the tone of "hey, you look like your working out or something". I received a similar comment from another closer female coworker but none from any of the fellas. I don't have a lot of breast growth, I'm about an official "a-cup" and I mainly dress in male mode with facial hair, but my feminine wardrobe is slightly larger than my male wardrobe. Even still, I don't get comments or questions regarding my gender. I believe my "around everyone" mannerisms differ from my "around those that know" mannerisms and that tends to make a huge difference. While my breast size seemed insufficient in size to me, my ex-wife noticed them with no problem about 4 months ago. She's the only one that has noticed enough to say something. I see my mom most of the day and several other family members and neither of them have said anything either. Well my mom commented on my butt looking bigger than hers one day when I was wearing some pants 1 size smaller than normal. Completely unexpected because I'd been focused more on the growth of my breast than anything else, so to realize my butt had grown more than expected was a pinch of a shocker. I believe that as said before though one can probably go stealth indefinitely depending on ones mannerisms, style of dress, and degree of facial transformation as I think people see a person's face first and use that to base what gender they believe a person is. However mannerisms and dress may reveal something different. In the past few months my butt has been absorbing the bulk of my HRT, so right now my behind looks totally female, and that can be hidden under male pants, but not in anything form fitting. I believe as long as facial hair exists and your not Dolly Parton or look pregnant you can pull it off almost forever.