Heh, wait until you come round to emerge KDE
I have already emerged gnome from source (hate KDE), and it took around an hour and a half to two hours. What hardware do you have? I have a P4 2.6 ghz w./ HT and 1/2 gig of RAM. I found compile times to be acceptable.

I was joking man
Yeah, I know, but I wanted to make it clear that I really like Slack, it just isn't what I would use.