How Many U.S. Wars Equal the One in Afghanistan? Afghanistan is America’s longest war — about 6,000 days. If you overlay that with World War II's duration, D-Day would have happened in 2004. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Macron to Fire Aide Who Hit Protester, but Pressure MountsSingapore’s Prime Minister Among 1.5 Million Affected by CyberattackSaturday Profile: Rapper Translates U.K.’s Angry Underprivileged for the Middle and Upper ClassesTribe’s Lone Survivor Glimpsed in Amazon Jungle, Healthy and at WorkHold Still, Butterflies. Britain Is Counting.Man Arrested After Knife Attack on German Bus