How long is 47 hours?
It's about four-fifths as long as The Great Chicago Fire

The length of The Great Chicago Fire is about 60 hours.
(1871) (Chicago, Illinois)
It's about one-and-two-fifths times as long as The Battle of Fort Sumter

The length of The Battle of Fort Sumter is about 33 hours.
(1861)
It's about two-fifths as long as The Voyage of the Titanic
The length of The Voyage of the Titanic is about 110.30 hours.
(a.k.a. RMS Titanic) (1912) (from Southampton, Hampshire, England to near the Grand Banks of Newfoundland)
It's about three times as long as The First Transatlantic Flight (Alcock and Brown, 1919)
The length of The First Transatlantic Flight (Alcock and Brown, 1919) is about 16.20 hours.
(John Alcock and Arthur Whitten Brown) (1919) (first non-stop flight)
It's about three times as long as The First light bulb test (Edison, 1879)
The length of The First light bulb test (Edison, 1879) is about 14.50 hours.
(Thomas Edison's filament Thread No. 9) (1879) (total time)
It's about one-fourth as long as The Apollo 11 Mission
The length of The Apollo 11 Mission is about 195.310 hours.
(1969) (total mission length)
It's about five-and-a-half times as long as The Longest Pro Baseball Game
The length of The Longest Pro Baseball Game is about 8.420 hours.
(1981) (McCoy Stadium, Pawtucket, Rhode Island)
It's about seven times as long as The First Indianapolis 500

The length of The First Indianapolis 500 is about 6.70220 hours.
(a.k.a. Indy 500, a.k.a. International 500-Mile Sweepstakes Race) (1911) (Indianapolis, Indiana)
It's about one-tenth as long as Boniface VI's reign
The length of Boniface VI's reign is about 360 hours.
(AD 896)
It's about twelve-and-a-half times as long as Gone with the Wind (film)
The length of Gone with the Wind (film) is about 3.780 hours.
(1939)
It's about one-fifteenth as long as a William Henry Harrison's Presidency
The length of a William Henry Harrison's Presidency is about 756.40 hours.
(a.k.a. William Henry Harrison, a.k.a. "Tippecanoe," a.k.a. "Old Tippecanoe") (1841)
It's about one-twenty-fifth as long as The First US Continental Congress

The length of The First US Continental Congress is about 1,200 hours.
(1774) (Philadelphia, Pennsylvania)
It's about thirty times as long as a Football match (Soccer game)
The length of a Football match (Soccer game) is about 1.50 hours.
(a.k.a. Association Football, a.k.a. soccer) (per FIFA rules; playing time only)
It's about one-thirty-fifth as long as Columbus' voyage to America
The length of Columbus' voyage to America is about 2,000 hours.
(1492) (first voyage)
It's about one-thirty-fifth as long as The Voyage of the Mayflower
The length of The Voyage of the Mayflower is about 1,600 hours.
(1620)