In the last century, throughout most Middle Eastern countries, it was common to give the distances between cities in walking distances. For example, Khaybar is ten days' journey by foot to Jeddah. See also. Pacing (surveying) Pace (unit) League (unit) Parasang; Biblical mile; References
A mass-market paperback is a small, usually non-illustrated, inexpensive bookbinding format. This includes the UK A-format books of 110 mm Ã 178 mm (4.3 in Ã 7.0 in) and the US pocketbook format books of a similar size.
The 250-word page is a really low estimate that's generally used to calculate manuscript pages, not printed books. For print books, a mass-market paperback runs around 300-350 words per page. A trade paperback (6x9) (or hardcover) runs around 350-400 depending on typesetting.