A 'Mile', like a "way", signifies a progression in states of understanding or of love. It can be a progression in a good direction, or in a bad one.

Apocalypse Explained 556:9, in discussing the famous "going the extra mile" verse in Matthew 5:41, mentions its similarity to the concept "way", and "way" is treated of in Arcana Coelestia 2287, 2331, 2333, 3142, and elsewhere.

2287. That 'Jehovah departed, when He had finished speaking to Abraham' means that this state of perception which existed with the Lord now ceased to be such is clear from the meaning of 'speaking' and from the representation of 'Abraham'. In the internal sense 'speaking' means thinking, as shown above in 2271. Here however it means perceiving because it is said of Jehovah that 'He finished speaking to Abraham'; for thought flowed from the perception, as stated already, and the perception from the Lord's internal, which was Jehovah. 'Abraham' however in this chapter represents the Lord when the human state existed with Him, as stated often above. From this it becomes clear that the words 'Jehovah departed, when He had finished speaking to Abraham' mean nothing else in the internal sense than that this state of perception which existed with the Lord now ceased to be. For the reason why in this chapter in the internal sense the Lord's perception and thought are dealt with so much, see above in 2249.