EinOdMilvado,
On Shabbos I daven at a hashkoma minyan that lasts about an hour and a half to an hour and 45 minutes with a kiddush afterwards, and there is still a problem with talking. And it’s the same people every week. As much as we want to be nice and blame circumstances for the talking, I feel that, unfortunately, the problem is due to a lack of respect on the part of the talkers. Lack of respect for the minyan, for the other mispallelim, and for Hashem. Yom Kippur davening lasts all day, and there is no talking problem. I think that’s because on Yom Kippur, everyone is aware that we are going to shul to daven.