Time: Retired Coast Guard Admiral Thad Allen doesn’t like to give deadlines for operations on BP’s blown Macondo well anymore – and you can’t really blame him. Almost every estimate Allen has given on how long it will take to finally kill BP’s well has proven overly optimistic. The final bottom kill – which was supposed to be completed by mid-August – has dragged on and on, as BP and its government counterparts have struggled to deal with one unexpected obstacle after another. Those problems …