So, what exactly happened to my buds?

Guys, i've been growing these for 4-5 months. I have 4 females, which started flowering around a month ago. I had a friend help me with all the growing, and i managed to raise the kids to a reasonable size (yes, they are small, but i think thats ok for a first timer). Thing is, a while ago, the hairs of my flowers started to turn brownish. I asked a friend, and he said i should wait for about 50 more days. I was ok with that, since the buds are very small, but is it ok for them to be turning brown so fast?

Any help is appreciated! Thanks!

Looks about right, at least 4 weeks, probably more. The hair color turn is strain related, doesn't sound out of the ordinary.

Yeah, comparing to other pictures, the buds look ridiculously small, and i bet they are... i wonder if they are going to grow to become one of those monsters i usually see in pics. Or at least close...
I got scared because i could probably say the brown hairs are somewhere around 20% of the total, and people usually say to harvest at 50-50, and they are still so small... well, i will keep feeding them, then! Thanks!

Brown hairs doesn't necessarily mean brown trichs, which is the harvest target for many. You'll need a loupe/scope to check those out. Might make you feel better to do it sooner than later.

you judge by the trichomes when to harvest not the hairs,