Is That A Big Number?

If Length of Tower Bridge over the Thames (244 m) was a standard unit ...

Length of the Rhine River (1,233 km)...more would be 5000 x Length of Tower Bridge over the Thames

Direct distance from Land's End to John o' Groats (970 km)...more would be 4000 x Length of Tower Bridge over the Thames

Length of the St Lawrence Seaway Canal system (600 km)...more would be 2500 x Length of Tower Bridge over the Thames

Diameter of the (fictional) Death Star in the first Star Wars movie (120 km)...more would be 500 x Length of Tower Bridge over the Thames

Length of the Kiel Canal (98 km)...more would be 400 x Length of Tower Bridge over the Thames

Length of the Epsom Derby horse race (2.4 km)...more would be 10 x Length of Tower Bridge over the Thames

Length of the Lincoln Memorial Reflecting pool in Washington DC (618 m)...more would be 2.5 x Length of Tower Bridge over the Thames

World record longest flight of an arrow from a bow (2010) (484 m)...more would be 2 x Length of Tower Bridge over the Thames

Length of an ice-hockey rink (61 m)...more would be 1/4 of Length of Tower Bridge over the Thames

Height of a typical Hot Air Balloon (24 m)...more would be 1/10 of Length of Tower Bridge over the Thames

Estimated length of Tyrannosaurus Rex (12.3 m)...more would be 1/20 of Length of Tower Bridge over the Thames

Length overall of a `49er` racing dinghy (4.88 m)...more would be 1/50 of Length of Tower Bridge over the Thames

Yes, there's now a book based on these numbers. Oxford University Press: July 2018.