Growing facial hair took a very long time for me. During the first 2 months I had absolutely nothing (except from the little bit of sideburn fuzz I had since pre-T). I never used minoxidil, but here's an approximate timeline for my beard:
*At around 5-6 months on T: I started getting a little bit on my chin and sideburns, but not enough to grow it out successfully. It also grew extremely slowly.
*At around 1 year: I got more under my chin and down my neck.
*At around 1,5 or 2 years on T: I had enough to save out a decent goatee, sideburns and along my jawline, but not cheeks or mustache.
*At 3 years on T: my mustache finally started to come in and my cheeks filled in a bit too.
*At 3,5 years on T: I could finally have a full beard with a low cheek line. Most hairs are dark brown, thick and unevenly curly, but about 10% or so are light blonde, for some reason, so I dye it. (My head hair and other body hair's natural colour is dark brown).
The beard situation hasn't changed much since then for me, now at 4,5 years on T, but I occasionally still keep getting random new stray hairs here and there. I have good genes for facial hair in my family (lots of bearded men on both mother's and father's side), which I know is an important factor to consider as well. Facial hair was the slowest change for me as well, along with chest hair. I never got much of any arm hair though. But I had already gotten all other changes by the time my facial hair started coming around.