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How fast is 123 inches per hour?

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It's about one-sixty-five-thousandth as fast as a Tornado.
In other words, 123 inches per hour is 0.00001571893 times the speed of a Tornado, and the speed of a Tornado is 63,617.56 times that amount.
(EF2) (wind speed range average)
According to the Enhanced Fujita scale implemented by the US National Oceanographic and Atmospheric Administration, a "significant" tornado has an Enhanced Funjita scale classification of EF2 and is characterized by wind gust speeds between 6,969,600 inches per hour and 8,680,320 inches per hour. The largest recorded tornado — an F4 event occurring in Nebraska in May, 2004 — was almost 4.02 km (2.5 mi) across.
It's about one-eighty-five-thousandth as fast as a Skydiver (headfirst).
In other words, the speed of a Skydiver (headfirst) is 83,000 times 123 inches per hour.
(Head-to-Earth orientation or standing, average conditions, terminal velocity)
A head-to-Earth or standing-oriented skydiver's terminal velocity assuming average conditions is about 10,000,000 inches per hour. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 46 seconds.
It's about one-ninety-thousandth as fast as a Helicopter.
In other words, the speed of a Helicopter is 90,900 times 123 inches per hour.
(for AH-64A Apache, a.k.a. Hughes Model 77) (maximum cruise speed)
The AH-64 helicopter, one of the primary helicopters used by the United States Army, flies at a top cruise speed of 11,200,000 inches per hour. The AH-64 is the primary military helicopter of several nations including the United States, the United Kingdom, Israel, Japan, and the Netherlands.
It's about one-one-hundred-thousandth as fast as a Lamborghini Gallardo.
In other words, 123 inches per hour is 0.0000098 times the speed of a Lamborghini Gallardo, and the speed of a Lamborghini Gallardo is 100,000 times that amount.
(for Gallardo LP 550-2, a.k.a. Valentino Balboni, 2009 model)
The Lamborghini Gallardo LP550-2 model Gallardo has a top speed of 13,000,000 inches per hour. The Gallardo can reach speeds of 3,900,000 inches per hour in just 3.9 seconds.
It's about one-one-hundred-thousandth as fast as The TGV (train).
In other words, 123 inches per hour is 0.0000098 times the speed of The TGV (train), and the speed of The TGV (train) is 100,000 times that amount.
(Train à Grande Vitesse) (for SNCF TGV Réseau, a.k.a. "Network" model, a.k.a. TGV-R) (maximum speed)
The TGV Réseau sets have a top speed of 13,000,000 inches per hour. The train is capable of travelling the 425 km (264 mi) distance from Paris to Lyon in East-Central France in about two hours.
It's about one-one-hundred-thousandth as fast as an Arrow (archery).
In other words, 123 inches per hour is 0.000009678 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 103,300 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 12,710,000 inches per hour when fired from a 60-lb, 28-inch draw bow . Archeological evidence from the Ahrensburg valley near Hamburg, Germany indicates that arrows have been used since at least 11 to 12,000 years ago.
It's about one-one-hundred-thousandth as fast as a Porsche 911.
In other words, 123 inches per hour is 0.00000949 times the speed of a Porsche 911, and the speed of a Porsche 911 is 105,000 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 13,000,000 inches per hour. It takes just 7.4 seconds for the GT2 to accelerate to 6,340,000 inches per hour.