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In the bible it is not as precisely defined as other Biblical measurements of distance; the distance has been estimated from 32 to 40 kilometers (20–25 miles).
In translation by J.B. Bury (Priscus, fr. 8 in Fragmenta Historicorum Graecorum) We set out with the barbarians, and arrived at Sardica, which is thirteen days for a fast traveller from Constantinople. From Constantinople-Istambul to Sofia is 550–720 km distance at a pace between 42 and 55 km /day.