Naval blockades, military history has shown, require patience. That is not the leading attribute of the American commander in chief. So when President Trump imposed a blockade of Iranian ports in April, the quick result he was looking for — a reopening of the Strait of Hormuz to commercial traffic — was not in the cards. Wearing down an enemy with a blockade can take months or years, military experts say, and certainly not weeks. Iran, with thousands of miles of land borders with seven