The U.S. Postal Service’s plan to change the hours of operation at 13,000 local post offices nationwide is set to launch next week, according to USPS officials. The agency’s Post Office Structure Plan—also known as POStPlan—was first unveiled in May. It potentially limits retail window hours of operation at some post offices to two, four or six hours per weekday. Residents in some of the affected communities will begin receiving surveys next week from their postal service district offices with details about forthcoming community meetings, kicking off a two-year process in which the agency will reduce hours of operations and...