Responses to T tend to vary pretty widely.
I self medicated for the first month and a half I was on T consistently, which is a terrible idea, but I had been turned away by two doctors and well...that's that.
I noticed growth after about a week on a low dose of gel. I went from about 1/4 inch to maybe 1 inch or 1.5 inches vacuum pumped after 5 weeks. Growth stopped completely at that point and has not resumed. Sorry if this is TMI. It bothers me a lot that nothing's happening there.
My voice started changing noticeably at about 6 weeks in that it lost its feminine squeakiness (Google Jean Arthur...that), but it wasn't creaky and warbling until 8 weeks. Mileage will vary! I'm a couple days away from 5 months now. My voice sounds mostly masculine, but still has its moments. I'm thinking it will even out soon, maybe by 8 months.
I've tracked some of the changes, but body hair wasn't one of them. A tiny bit of chest hair...a little over four months. Facial hair is still minimal, but I have had the outline of a mustache since 2.5 months into this.