I really don't know.
I went full time after a little over three months of HRT, and well...I never get sir'd.
The truth is I did not really transition in boy mode, so I have no clue if I would even pass as a boy at this point. I was pretty much androgynous enough to pass as both when I went full time, and my body was pretty much feminine when I did so. Why would I want to go back to living that lie when I am pretty happy where I am now.
So it really only reflects one way you can transition. I did part time for about a month, and well got really confused and shortly there after went full time.