The U.S. Postal Service has agreed to extend the hours of a post office on a Maine island. The Postal Service originally put the Cliff Island post office on its closure list last year, but later agreed to keep it open for only two hours a day. Cliff Island, which is part of the city of Portland, is 10 miles from the mainland and takes more than an hour to reach by ferry. Congresswoman Chellie Pingree says the Postal Service has now agreed to keep the office open for six hours a day. Pingree, who lives on North Haven island off the midcoast of Maine, argued for longer hours, saying it’s vital to keep island post offices open because of the role they play in small communities.