21.340 seconds is about one-one-hundred-fifty-thousandth as long as a William Henry Harrison's Presidency
In other words, it's 0.0000078370 times the length of a William Henry Harrison's Presidency, and the length of a William Henry Harrison's Presidency is 127,600 times that amount.
(a.k.a. William Henry Harrison, a.k.a. "Tippecanoe," a.k.a. "Old Tippecanoe") (1841) Having caught pneumonia and pleurisy early in his term as President of the United States, William Henry Harrison died after 2,723,000 seconds minutes in office. Following his death, Congress approved a Presidential widow's pension for Harrison's wife, Anna Symmes, who received a year's worth of Harrison's presidential salary — $25,000 — and the right to free postage for the remainder of her life.