 The last ship was the SS "Coastal Ranger", whose keel was laid on June 7, 1945 and launched on August 25, 1945.The first six ships took 305 to 331 days each to complete, but soon production ramped up and most of the remaining ships were built in about two months, bringing the average down to 89 days each.By November 1943, about four ships were launched per month.