I started about 3 months before officially starting HRT.
I was told about 1-2 years.
People do notice. One of my coworkers asked me about it and I told him basically MYOB. He's also looking at my chest, and I have the "I'm up here dude, not down there" convo pretty often. I want to report him to HR because he's not listening to me. Last week he came up and asked questions about work... He said "ok I was just curious." But he was staring at my chest. I asked him,"anything else you curious about, buddy?" He just laughed and said no and walked away.
Anyway he asked if I removed my mustache. I said basically why is he asking such a silly question. He is making me very uncomfortable now.