Under a month my voice went to crap. I couldn't hit ANY notes. Like, couldn't carry a tune in a bucket anymore. Within a month, so if you're already experiencing changes, you might want to get those tunes banged out before your voice goes. I'm five and some change on T and it's just now starting to even out in the LOW range. High range (think "Don't get lost in Heaven, by the Gorillaz, I could hit ALL those notes before) I can't get even close to without a crack and then my voice just shuts completely down. If I had to scream, I probably couldn't. I can yell like hell now, whereas before I couldn't really, but screaming it just cuts off.
My vocal coach and the bassist I sing with have both told me my voice is around the Avett Brothers/Don McLean/John Denver range now, which is fine with me, but it's still dropping. I'm not sure where it's going to end up at. Hopefully a nice smooth baritone or deep tenor.