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How fast is 123 inches per hour?

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It's about one-ten-thousandth as fast as Flo-Jo.
In other words, 123 inches per hour is 0.0000926 times the speed of Flo-Jo, and the speed of Flo-Jo is 10,800 times that amount.
(at the Seoul Olympics, 1998) (a.k.a. Florence Griffith-Joyner, a.k.a. Florence Delorez Griffith) (swimmer; 1959-1998)
Setting a world record in 1988, Flo-Jo ran a 200 m in 0:21.34 for an average speed of 1,328,000 inches per hour. Known as a 200 m runner, Joyner also set a record time in a 100 m race at in 1987.
It's about one-ten-thousandth as fast as Usain Bolt.
In other words, 123 inches per hour is 0.0000843 times the speed of Usain Bolt, and the speed of Usain Bolt is 11,900 times that amount.
(at the Beijing Olympics, 2008) (a.k.a. Usain St. Leo Bolt, OJ, C.D.) (sprinter; 1986-)
Setting a world record, Usain Bolt ran a 100 m in 0:09.69 for an average speed of 1,460,000 inches per hour at the 2008 Olympics. Furthermore, Bolt's margin of record breaking — 0.03 s — is the largest margin of victory in the history of digital measurements.
It's about one-ten-thousandth as fast as Michael Johnson.
In other words, 123 inches per hour is 0.00008385 times the speed of Michael Johnson, and the speed of Michael Johnson is 11,930 times that amount.
(a.k.a. Michael Duane Johnson) (sprinter; 1967-) (at the Atlanta Olympics, 1996)
Setting a record that stood for 12 years, Michael Johnson ran a 200 m in 0:19.32 for an average speed of 1,467,000 inches per hour at the 1996 Olympics. Johnson was nicknamed "the Man with the Golden shoes" in recognition of the custom footwear worn during these races — a pair of Nikes with a left size of 10.5 and a right size of 11.
It's about one-twenty-thousandth as fast as Secretariat.
In other words, 123 inches per hour is 0.0000517 times the speed of Secretariat, and the speed of Secretariat is 19,300 times that amount.
(at Belmont Stakes, 1973)
Setting a record finish, Secretariat ran the Belmont Stakes — a 12 furlong race length — in 2:24, for an average speed of 2,380,000 inches per hour in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.
It's about 20,000 times as fast as Grass growing.
In other words, 123 inches per hour is 22,000 times the speed of Grass growing, and the speed of Grass growing is 0.000045 times that amount.
(for Kentucky Bluegrass, Poa pratensis) (a.k.a. Smooth Meadow grass, a.k.a. Common Meadow grass) (Summer months, ideal growing conditions)
Kentucky Bluegrass, one of the most common grasses in North America, grows about an inch per week in the summer months under ideal conditions. When left un-mowed, Kentucky Bluegrass grows to heights of 60 to 90 cm (2 to 3 ft) and blossoms with a blue flower.
It's about one-twenty-five-thousandth as fast as a Greyhound.
In other words, the speed of a Greyhound is 23,100 times 123 inches per hour.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 2,850,000 inches per hour. Despite their racing prowess, greyhounds are not considered energetic dogs — the typical greyhound race requires the dogs to run for less than 35 seconds.
It's about one-twenty-five-thousandth as fast as a Gazelle.
In other words, the speed of a Gazelle is 30,000 times 123 inches per hour.
(for Thomson's Gazelle, a.k.a. Eudorcas thomsoni, a.k.a. "Tommie", a.k.a. "Tommy")
A Thomson's gazelle can reach speeds of up to 3,000,000 inches per hour. The gazelle's speed doesn't match that of its chief predator, the cheetah, but a gazelle's endurance usually ensures an escape in distances greater than 500 m (0.3 mi).