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How fast is 504 feet per hour?

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It's about one-two-thousand-five-hundredth as fast as a Peregrine Falcon.
In other words, 504 feet per hour is 0.000395 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 2,530 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 1,280,000 feet 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-eight-thousandth as fast as The Speed of Sound.
In other words, 504 feet per hour is 0.000124 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 8,060 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 4,050,000 feet per hour. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 17,700,000 feet per hour to 18,400,000 feet per hour in water, depending on its salinity.
It's about one-nine-thousandth as fast as a Bullet (Handgun).
In other words, 504 feet per hour is 0.000111 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 9,010 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 4,530,000 feet 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-fifteen-thousandth as fast as a Jet Fighter.
In other words, the speed of a Jet Fighter is 16,000 times 504 feet per hour.
(for Lockheed Martin F-16, a.k.a. Fighting Falcon, a.k.a. Viper) (maximum speed at altitude)
An F-16's maximum speed at altitude is approximately 7,800,000 feet per hour. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about one-twenty-thousandth as fast as a Bullet (Rifle).
In other words, 504 feet per hour is 0.00004660 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 21,500 times that amount.
(5.56 x 45 mm, a.k.a. 5.56 NATO)
A 5.56 x 45 mm cartridge is fired at a velocity of 10,800,000 feet per hour. As the NATO rifle cartridge, it is used by the military forces of more than thirty-one countries, including use in the M16 series, M4 Carbine, HK-416, and M249 Squad automatic weapons used by the United States armed forces.
It's about one-two-hundred-thousandth as fast as The Space Shuttle.
In other words, 504 feet per hour is 0.00000551060 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 181,470 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 91,460,000 feet 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.
It's about one-one-millionth as fast as a Meteor.
In other words, 504 feet per hour is 0.000001000 times the speed of a Meteor, and the speed of a Meteor is 1,000,000 times that amount.
(formally Meteoroid or meteorite, depending on the context; a.k.a. "shooting star", a.k.a. "falling star")
Small meteoroids enter the Earth's atmosphere at speeds between 130,000,000 feet per hour and 850,000,000 feet per hour, depending on their size. The fireball effect, known as ablation, ceases once the atmosphere has slowed the meteoroid to a velocity of about 33,000,000 feet per hour.