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How fast is 123 inches per hour?

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It's about one-twenty-five-thousandth as fast as a Hare.
In other words, the speed of a Hare is 30,000 times 123 inches per hour.
(for European Brown Hare, a.k.a. Brown Hare, a.k.a. Lepus europaeus, a.k.a. Brown Hare)
The European Hare can run at speeds of up to 3,000,000 inches per hour. While speed is a factor in their escapes, hares evade their chief predators — wolves, foxes, and golden eagles — by fleeing in a zigzag pattern.
It's about one-thirty-five-thousandth as fast as a Knuckleball (baseball).
In other words, the speed of a Knuckleball (baseball) is 34,000 times 123 inches per hour.
(a.k.a. knuckler, a.k.a. floater, a.k.a. dancer, a.k.a. butterfly ball) (major league average)
The average speed of major league knuckleball pitch is 4,300,000 inches per hour. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.
It's about one-thirty-five-thousandth as fast as a Cheetah.
In other words, 123 inches per hour is 0.00002828 times the speed of a Cheetah, and the speed of a Cheetah is 35,360 times that amount.
(Acinonyx jubatus)
The cheetah can reach speeds of up to 4,350,000 inches per hour in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds.
It's about one-forty-thousandth as fast as a Hurricane.
In other words, 123 inches per hour is 0.0000262 times the speed of a Hurricane, and the speed of a Hurricane is 38,200 times that amount.
(formally: Topical cyclone; a.k.a. typhoon)
A hurricane is defined by the US National Hurricane Center as a Northern Hemisphere tropical storm having one-minute average wind-speeds of at least 4,690,000 inches per hour. Typhoons Tip (October, 1979) and Keith (October, 1997) and Hurricanes Camille (August, 1969) and Allen (August, 1980) jointly hold the record for highest tropical storm wind speeds at 12,200,000 inches per hour.
It's about one-forty-thousandth as fast as a Curveball (baseball).
In other words, the speed of a Curveball (baseball) is 38,000 times 123 inches per hour.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 4,700,000 inches per hour. In the 1940's, debate over whether there really was a curve in the curveball pitch was settled with the conclusion that the ball does curve; however, an optical illusion caused by the spin of the ball and the batter's perception of motion exaggerates the extent of the curve.
It's about one-fifty-thousandth as fast as a Fastball (baseball).
In other words, the speed of a Fastball (baseball) is 48,000 times 123 inches per hour.
(a.k.a. rising fastball, a.k.a. cross-seam fastball, a.k.a. heater, a.k.a. hummer, a.k.a. smoker; for four-seam grip) (major league average)
The average speed of major league fastball pitch is 5,900,000 inches per hour. When up against the quickest professional fastball pitchers, a batter may have less than 0.4 seconds to react to a pitched ball.
It's about one-sixty-five-thousandth as fast as a Skydiver (belly-to-earth).
In other words, the speed of a Skydiver (belly-to-earth) is 63,000 times 123 inches per hour.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 7,500,000 inches per hour. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 60 seconds.