Deuteronomy 1:2

(It is an eleven-day journey from Horeb by the way of Mount Seir to Kadesh Barnea.)
Deuteronomy 1:2 Modern English Version (MEV)
 
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There are eleven days' journey from Horeb, by the way of Mount Seir, to Kadeshbarnea. Not that the Israelites came thither in eleven days from Horeb, for they stayed by the way at Kibrothhattaavah, a whole month at least, and seven days at Hazeroth; but the sense is, that this was the computed distance between the two places; it was what was reckoned a man might walk in eleven days; and if we reckon a day's journey twenty miles, of which See Gill on Jon_3:3, the distance must be two hundred and twenty miles. But Dr. Shaw (e) allows but ten miles for a day's journey, and then it was no more than one hundred and ten, and indeed a camp cannot be thought to move faster; but not the day's journey of a camp, but of a man, seems to be intended, who may very well walk twenty miles a day for eleven days running; but it seems more strange that another learned traveller (f) should place Kadeshbarnea at eight hours, or ninety miles distance only from Mount Sinai. Moses computes not the time that elapsed between those two places, including their stations, but only the time of travelling; and yet Jarchi says, though it was eleven days' journey according to common computation, the Israelites performed it in three days; for he observes that they set out from Horeb on the twentieth of Ijar, and on the twenty ninth of Sivan the spies were sent out from Kadeshbarnea; and if you take from hence the whole month they were at one place, and the seven days at another, there will be but three days left for them to travel in. And he adds, that the Shechinah, or divine Majesty, pushed them forward, to hasten their going into the land; but they corrupting themselves, he turned them about Mount Seir forty years. It is not easy to say for what reason these words are expressed, unless it be to show in how short a time the Israelites might have been in the land of Canaan, in a few days' journey from Horeb, had it not been for their murmurings and unbelief, for which they were turned into the wilderness again, and travelled about for the space of thirty eight years afterwards. Aben Ezra is of opinion, that the eleven days, for the word "journey" is not in the text, are to be connected with the preceding words; and that the sense is, that Moses spake these words in the above places, in the eleven days they went from Horeb to Kadesh.
(e) De loc. Heb. fol. 92. I. (f) Pococke's Description of the East, vol. 1. p. 157.
 
John Gill’s Exposition of the Bible