In more than half of Connecticut’s emergency rooms, the waiting time to see a health-care provider exceeds the national average of 28 minutes – a problem that experts say could get worse, as thousands more residents obtain health insurance. The average wait can stretch to an hour or more at Rockville General, Manchester Memorial, Bridgeport, Waterbury and Hartford hospitals, according to a C-HIT review of federal data. The statewide average waiting time is 30 minutes. The longest wait time is at Hartford Hospital, where patients were not seen for 82 minutes, on average; the shortest wait of 14 minutes is at Windham Hospital, the data compiled by the Centers for Medicare & Medicaid Services (CMS) through 2012 show. Officials at Hartford and Bridgeport hospitals claim shorter wait times than the federal data.