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How fast is 865 times the speed of light?

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It's about 750,000,000 times as fast as The Speed of Sound.
In other words, 865 times the speed of light is 756,000,000 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 0.00000000132 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 0.00000114 times the speed of light. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 0.00000499 times the speed of light to 0.0000052 times the speed of light in water, depending on its salinity.
It's about 2,500,000,000 times as fast as a Peregrine Falcon.
In other words, the speed of a Peregrine Falcon is 0.000000000417 times 865 times the speed of light.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 0.00000036 times the speed of light 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 2,500,000,000 times as fast as The CRH (train).
In other words, the speed of The CRH (train) is 0.00000000037 times 865 times the speed of light.
(a.k.a. Hexie Hao, 和谐号, a.k.a. 和諧號, a.k.a. Héxié Hào, a.k.a. "Harmony")
The CRH-3 train which runs on China's Beijing-Tianjin Intercity Railway are capable of speeds up to 0.00000032 times the speed of light. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.
It's about 3,000,000,000 times as fast as a Porsche 911.
In other words, 865 times the speed of light is 2,840,000,000 times the speed of a Porsche 911, and the speed of a Porsche 911 is 0.000000000352 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 0.000000305 times the speed of light. It takes just 7.4 seconds for the GT2 to accelerate to 0.000000149 times the speed of light.
It's about 3,000,000,000 times as fast as an Arrow (archery).
In other words, 865 times the speed of light is 2,892,000,000 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 0.0000000003458 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 0.0000002991 times the speed of light 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 3,000,000,000 times as fast as a Lamborghini Gallardo.
In other words, 865 times the speed of light is 2,900,000,000 times the speed of a Lamborghini Gallardo, and the speed of a Lamborghini Gallardo is 0.00000000034 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 0.0000003 times the speed of light. The Gallardo can reach speeds of 0.000000093 times the speed of light in just 3.9 seconds.
It's about 3,000,000,000 times as fast as The TGV (train).
In other words, 865 times the speed of light is 2,900,000,000 times the speed of The TGV (train), and the speed of The TGV (train) is 0.00000000034 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 0.0000003 times the speed of light. The train is capable of travelling the 425 km (264 mi) distance from Paris to Lyon in East-Central France in about two hours.