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How fast is 123 inches per hour?

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It's about one-one-hundred-thousandth as fast as The CRH (train).
In other words, 123 inches per hour is 0.0000089 times the speed of The CRH (train), and the speed of The CRH (train) is 110,000 times that amount.
(a.k.a. Hexie Hao, 和谐号, a.k.a. 和諧號, a.k.a. Héxié Hào, a.k.a. "Harmony")
It's about one-one-hundred-thousandth as fast as a Peregrine Falcon.
In other words, 123 inches per hour is 0.00000804 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 124,000 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 15,300,000 inches per hour when diving. Falcons are sometimes sent to scare smaller birds away from airports to improve air traffic safety and were used in World War II to intercept carrier pigeons used by enemy forces.
It's about one-four-hundred-thousandth as fast as The Speed of Sound.
In other words, 123 inches per hour is 0.00000253 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 395,000 times that amount.
(in dry air at 20°C)
It's about one-four-hundred-fifty-thousandth as fast as a Bullet (Handgun).
In other words, 123 inches per hour is 0.00000226 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 442,000 times that amount.
(for .40 Smith & Wesson 135 grain Sierra JHP, VV 3N37 powder, Fed. 100 primer, Remington case) (muzzle velocity)
A 0.40 caliber Smith & Wesson bullet has a muzzle a velocity of 54,300,000 inches per hour. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.
It's about one-seven-hundred-fifty-thousandth as fast as a Jet Fighter.
In other words, the speed of a Jet Fighter is 770,000 times 123 inches per hour.
(for Lockheed Martin F-16, a.k.a. Fighting Falcon, a.k.a. Viper) (maximum speed at altitude)
It's about 0.0000010 times as fast as a Bullet (Rifle).
In other words, 123 inches per hour is 0.000000948 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 1,050,000 times that amount.
(5.56 x 45 mm, a.k.a. 5.56 NATO)
It's about 0.0000001 times as fast as The Space Shuttle.
In other words, 123 inches per hour is 0.00000011207 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 8,923,000 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 1,097,500,000 inches per hour. During liftoff, the space shuttle accelerates to orbital speed in 8.5 minutes, consuming over 1.59 million kg (3.51 million lbs) of propellant in the process.