It's pretty much a movable feast and may depend on many factors - how you feel you look, your confidence, your wardrobe, your body language and self-expression, your voice, etc. For some people some or all or things matter, for other it's varying degrees of not at all. When I started transition I really expected it would be at least two years before I went full time, in the end it was about seven months. So don't lock yourself into any preconceived timeline - best to wait and see once you're on the roller coaster! 🙂