I agree with only 1 or 2, the rest being quickish ones. I loved my first ever proper BRD group, we were in there for 4 hours, didn't clear it but it was awesome all the same. Again with Stratholme, first time I went there, we were in for around 6 hours lol, cleared the human side and got a few bosses on the undead. Couldn't do it all the time, but it is fun now and again.