I haven't had a run for TPD go past 18 minutes, and that was a run where we got the wing beats.
And for Mourning, past the 2nd day I haven't seen a group fail to kill Fodrus and Execour or go beyond the 14 minute mark. Absolutely I have no doubt if the stars align you could suffer a bad run. But I've been in general pleasantly surprised with the quality of NA puggies. A few good players will go a long way as well, so make sure you yourself know your ins and outs before calling other people stupid.