
It's about onefifteenth as fast as a Sloth.
In other words, the speed of a Sloth is 14 times 666 inches per hour.
(for Brownthroated threetoed sloth, Bradypus variegatus)The threetoed sloth moves along the ground at an average speed of 9,400 inches per hour. Long thought to be lengthy sleepers, a 2008 study concluded that sloths sleep an average of only 9.6 hours per day.
It's about oneonehundredth as fast as an Iceberg.
In other words, the speed of an Iceberg is 100 times 666 inches per hour.
(a.k.a. Berg) (Newfoundland iceberg average)Moved by ocean currents and wind, icebergs can drift at speeds of about 70,000 inches per hour. The largest iceberg ever recorded was a found near Baffin Island, Nunavut and was estimated to be nine billion metric tons.
It's about onethreehundredth as fast as Walking Pedestrians (in Manhattan).
In other words, 666 inches per hour is 0.0036 times the speed of Walking Pedestrians (in Manhattan), and the speed of Walking Pedestrians (in Manhattan) is 280 times that amount.
(Manhattan; average speed; 8,978 personsample)A 2006 Study by the New York City Department of City Planning found that pedestrians in that city walk at an average rate of 180,000 inches per hour. Pedestrians wearing headphones, the study went on to find, walk at a slightly faster 200,000 inches per hour
It's about onefourhundredth as fast as Michael Phelps.
In other words, 666 inches per hour is 0.002419 times the speed of Michael Phelps, and the speed of Michael Phelps is 413.390 times that amount.
(at the Beijing Olympics, 2008; 200 m freestyle) (a.k.a. Michael Fred Phelps) (swimmer; 1985)Setting a world record, Michael Phelps swam the 200 m freestyle in 1:42.96 for an average speed of 275,310 inches per hour. Phelps would go on to win nine gold medals individually in the 2008 Olympics  more than all but eight of the competing nations.
It's about onesixhundredth as fast as a Crocodile.
In other words, 666 inches per hour is 0.0017 times the speed of a Crocodile, and the speed of a Crocodile is 590 times that amount.
(American Crocodile, Crocodylus acutus) (swimming speed)An American crocodile can reach speeds in the water of up to 390,000 inches per hour. On land, larger crocodiles can "gallop" when fleeing danger at speeds of up to 790,000 inches per hour.
It's about oneonethousandfivehundredth as fast as a Bull.
In other words, the speed of a Bull is 1,400 times 666 inches per hour.
(for animals involved in the Running of the Bulls, a.k.a. Encierro, San Fermin, Pamplona, Spain) (herd average speed)The herd of the annual Encierro in Pamplona, Spain runs at an average speed of 940,000 inches per hour. The Encierro is run annually from July 7^{th} through July 14^{th} and involves 42 bulls, 77 oxen, and an estimated 17,000 runners over the course of the event.
It's about oneonethousandfivehundredth as fast as Noah Ngeny.
In other words, 666 inches per hour is 0.0006201 times the speed of Noah Ngeny, and the speed of Noah Ngeny is 1,613 times that amount.
(in Rieti, Italy; 1999) (sprinter; 1978)Setting a world record at the Rieti Grand Prix in 1999, Noah Ngeny ran 1,000 m in 2:11.96 for an average speed of 1,074,000 inches per hour. According to some reports, Ngeny did not begin running competitively until just three years before setting the record. 
