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How fast is 0.666666667 times the speed of light?

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It's about two-thirds as fast as The Speed of Light.
In other words, 0.666666667 times the speed of light is 0.666666667 times the speed of The Speed of Light, and the speed of The Speed of Light is 1.5 times that amount.
(C) (in a vacuum)
The speed of light (and all other electromagnetic radiation) in a perfect vacuum is known as "c" and measures exactly 299,792,458 m/s, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 0.666666667 times the speed of light when passing through the glass of a typical window.
It's about 2,000 times as fast as a bolt of Lightning.
In other words, the speed of a bolt of Lightning is 0.0005 times 0.666666667 times the speed of light.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 0.00032 times the speed of light when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about 5,000 times as fast as a Meteor.
In other words, the speed of a Meteor is 0.00021 times 0.666666667 times the speed of light.
(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 0.000037 times the speed of light and 0.00024 times the speed of light, depending on their size. The fireball effect, known as ablation, ceases once the atmosphere has slowed the meteoroid to a velocity of about 0.0000093 times the speed of light.
It's about 25,000 times as fast as The Space Shuttle.
In other words, 0.666666667 times the speed of light is 25,810 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 0.000038745 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 0.00002583 times the speed of light. 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 200,000 times as fast as a Bullet (Rifle).
In other words, 0.666666667 times the speed of light is 218,000 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 0.00000459 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 0.00000305 times the speed of light. 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 300,000 times as fast as a Jet Fighter.
In other words, the speed of a Jet Fighter is 0.0000033 times 0.666666667 times the speed of light.
(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 0.0000022 times the speed of light. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about 500,000 times as fast as a Bullet (Handgun).
In other words, the speed of a Bullet (Handgun) is 0.00000192 times 0.666666667 times the speed of light.
(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 0.00000128 times the speed of light. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.