As of late, the sort at the DFW Airport hub has been runner increasingly longer. It is common to run over 5 hours these days. Those who work on air volumn seem to get absolutely no break or meal periods. Why is it only certain belts get rest breaks whereas many other areas don't get any at all. Personally, my productivity takes a MASSIVE nose dive after 4.5 - 5 hours of working straight non stop. This is very pronounced on small sorts because after 4 hours, the PPH tanks pretty hard across the entire board. I'm just putting this out because the union seemed to have no interest in making sure everyone in the building gets a break when the sort is expected to last more than 3 hours.