It's about nine-tenths as long as a Semitrailer.
In other words, 621 fingers is 0.9434 times the length of a Semitrailer, and the length of a Semitrailer is 1.06 times that amount.(a.k.a. semi-trailer truck, a.k.a. semi, a.k.a. tractor-trailer, a.k.a. truck and trailer, a.k.a. eighteen-wheeler, a.k.a. big rig, a.k.a. Mack truck, a.k.a. transport, a.k.a. lorry, a.k.a. artic; for box truck; United States Federal length limits)
According to the United States Department of Transportation (DOT), the maximum allowable length of a semitrailer pulled by a road tractor truck is 14.63 m (unless superseded by state law). These regulations also allow the vehicles to tow up to 36,000 kg in gross weight.
It's about nine-tenths as tall as The Hollywood Sign.
In other words, 621 fingers is 0.92 times the height of The Hollywood Sign, and the height of The Hollywood Sign is 1.1 times that amount.(a.k.a. Hollywoodland Sign) (Mount Lee, Hollywood Hills, Santa Monica Mountains, California)
Each of the white letters in the Hollywood Sign measures 15 m tall. Built as an advertisement in 1923, the sign was intended to stand for only eighteen months.
It's about one-and-one-tenth times as tall as a Brachiosaurus.
In other words, the height of a Brachiosaurus is 0.91 times 621 fingers.(based on comparable bone measurements, height to head)
Dinosaurs in the genus Brachiosaurus had an estimated height (at the head with neck fully extended) of up to 13 m. A resin cast of the first Brachiosaurus specimen, owned by the Field Museum in Chicago, is currently on display at the O'Hare International Airport.
It's about one-and-three-tenths times as tall as a Telephone Pole.
In other words, the height of a Telephone Pole is 0.77 times 621 fingers.(a.k.a. Utility Pole, a.k.a Power Pole, a.k.a. Telegraph Pole, a.k.a. Telegraph Post, a.k.a. Hydro Pole) (exposed height; per Florida Public Service Commission average)
A standard telephone pole is 11 m tall. Despite alternatives, most telephone poles in the US are made of wood — most commonly pine — and have a lifespan of 25 to 50 years, depending on climate and preservatives applied.
It's about seven-tenths as long as a Bowling Lane.
In other words, 621 fingers is 0.72049 times the length of a Bowling Lane, and the length of a Bowling Lane is 1.3879 times that amount.(USBC specifications; tenpin; including pin deck)
According to the United States Bowling Congress specifications, a tenpin bowling lane should measure 19.156 m. In a Professional Bowling Association game, the lane must be lubricated by about 25 ml (0.85 fl. oz) of oil.
It's about seven-tenths as long as a Cricket pitch.
In other words, 621 fingers is 0.68608 times the length of a Cricket pitch, and the length of a Cricket pitch is 1.45756 times that amount.(per Marylebone Cricket Council / International Cricket Council Law #7)
The length of a cricket pitch is 20.1168 m. The wickets at either end of the pitch stand 720 mm tall including the bails.
It's about one-and-two-thirds times as long as a London bus.
In other words, the length of a London bus is 0.606 times 621 fingers.(Routemaster Double-Decker, RM standard specification)
The Routemaster Double-Decker buses, well-known as icons of London, measure 8.38 m in length. The buses were said to be well-designed for travel in the London traffic, as they offered an open door for riders to board and exit even while the bus was moving at low speeds, and a full-time conductor to collect fares.