December 7, 1941 to May 8, 1945 is: 3 years, 5 months, 1 day:
The US converted the industrial base from peacetime to wartime production, mobilized and trained millions, built a global logistics system, built tens of thousands of tanks, artillery pieces, planes, jeeps, ships – carriers, cruisers, destroyers, transports, PT Boats, landing craft, - hundreds of thousands of tons of munitions, etc. etc. etc. cleared the Atlantic, turned the tide in North Africa, Invaded Italy and D-Day, Fought across Europe, the Battle of the Bulge, the Race to Berlin, and Germany surrenders - all while also fighting the Japanese in the Pacific and the CBI theaters. All without the internet, computers, faxes, copiers, cell phones, etc. etc. etc.
March 21st 2010 to October 1 2013 is: 3 years, 6 months, 10 days.
Not enough time for this administration to build a working website