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How long is 816 miles?

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It's about eleven-and-a-half times as long as The 405.
In other words, 816 miles is 11.2680 times the length of The 405, and the length of The 405 is 0.088747 times that amount.
(a.k.a. I-405, Interstate 405, San DIego Freeway) (Southern California)
Running from Irvine to San Fernando, The 405 runs a total of 72.4150 miles. The 405 is the most heavily-trafficed freeway in the United States, with an average speed as low as 8 kph during rush hours.
It's about twelve-and-a-half times as long as The English Channel.
In other words, the length of The English Channel is 0.0813 times 816 miles.
(average width between Isle of Ushant and The Walde Lighthouse) (La Manche, Ärmelkanal, Mor Breizh, Mor Bretannek) (a.k.a. The Channel)
The English Channel measures between 66.50 miles, narrowing as it flows northeast. The world speed record for a Channel crossing by swimmer was set by Australian Trent Grimsey in 2012, with a time of 6 hours, 55 minutes.
It's about fifteen times as long as The Panama Canal.
In other words, the length of The Panama Canal is 0.067 times 816 miles.
(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 55 miles in length. Ships passing through the Canal are raised (and then lowered) 0.016 miles above sea level through the lock-and-dam system.
It's about one-thirtieth as long as The Circumfrence of Earth.
In other words, 816 miles is 0.032769164 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 30.5164940 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has an Equatorial circumference of approximately 24,901.4590 miles. The first airplane trip around the circumference of the Earth (with a few stops along the way), was completed in 1924 by the United States Army Air Service, and took 175 days.
It's about 50 times as tall as Olympus Mons.
In other words, the height of Olympus Mons is 0.02 times 816 miles.
(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 17 miles. The mountain has been known to astronomers since the nineteenth century because it is tall enough to rise above Mars' frequent dust storms.
It's about 100 times as tall as Maxwell Montes.
In other words, 816 miles is 120 times the height of Maxwell Montes, and the height of Maxwell Montes is 0.0083 times that amount.
(Ishtar Terra, Venus)
Maxwell Montes rises to a total height of 6.80 miles. Since Venus does not seem to have the kind of tectonic activity which gives rise to mountains on Earth, the origin of the Venusian mountain remains the subject of some dispute.
It's about 100 times as tall as The Challenger Deep (Marianas Trench).
In other words, 816 miles is 120.460 times the height of The Challenger Deep (Marianas Trench), and the height of The Challenger Deep (Marianas Trench) is 0.0083015 times that amount.
(near Marianas Islands, a.k.a. Ladrones Islands, northwestern Pacific Ocean) (depth below sea level)
The Challenger Deep, at the southern end of the Marianas Trench, reaches a depth of 6.77420 miles below sea level. There has been only one manned expedition to the bottom of Challenger Deep — a 1960 voyage that took 4 hours and 48 minutes to reach the bottom.