Franklin Deleno Roosevelt served the most time in office: he was elected 4 times, each a 4 year span!  Though he died about a year after he was elected for the 4th time, he holds the record.  After he got the American people through the Great Depression, they just couldn't get enough of him!\n\nWilliam Harrison served the least--upon inaguration, he gave the longest speech ever, without a coat, and caught the chill.  He had less than a month to be Commander-in-Cheif!