Day's journey

A day's journey in pre-modern literature, including the Bible and ancient geographers and ethnographers such as Herodotus, is a measurement of distance.
In the Bible, it is not as precisely defined as other Biblical measurements of distance; the distance has been estimated from. Judges 19 records a party of three people and two mules who traveled from Bethlehem to Gibeah, a distance of about, in an afternoon. Porter notes that a mule can travel about, covering in an eight-hour day.
Another citation comes from Priscus and is translated thus by J. B. Bury: We set out with the barbarians, and arrived at Sardica, which is thirteen days for a fast traveller from Constantinople. The distance from Constantinople to Sofia is ; the passage therefore implies a pace between per day.
Based on a comprehensive review of references in Herodotus, Geus concludes that "Herodotus has a very well-defined notion of what distance a traveller can cover under normal circumstances in a day," though he cites some exceptional examples of over per day.