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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-)
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)
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)
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)
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)
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")