It depends on which bottom surgery we're talking about, though I'm pretty sure both would require it. If you want a metoidioplasty, then most surgeons need at least 1 year(usually 2) of testosterone therapy in order to have enough clitoral growth to work with.
From what I've seen, you'll need more than one month for the changes you want to occur. For the voice, I would give it at the very least 6-8 months to finish evening out. Facial hair is usually one of the effects that takes longer, so don't think a full beard is going to sprout within a month or two. And if you're young, male baldness shouldn't be too much of a worry either(unless your family is notorious for it at such a young age), though your hairline will likely become more masculine.
Think of it as a boy going through puberty, it takes a while.