It doesn't take that long if you are doing it with a good group. With the group I have now, I could probably do the key fragments in about 4 hours with a 15-30 minute break or so. The main problem is two of my friends were in Russia for three weeks so I had to rely on PUGs for Shadow Labs. Which is not very friendly to do when nobody knows how to do it. I remember going into a group as the last person, everyone knew each other already and I was the newbie come-along. They tossed me leader when I told them everything they needed to do all smart sounding like. :D

Plus, I hear Kara is really really fun.