What is the farthest someone can travel in 8 hours without teleporting?

This question asks about the highest speed someone can go, so it is about maximizing burst speed. However, being able to travel 600 mph isn’t really useful in combat. Perhaps it’s useful in short 10-minute bursts, but it is less sustainable for overland travel.

One use of high speeds, though, is overland travel. You care more about your speed when you actually want to go to a far away place. But here, a character follows different rules that rely only on speed, and not action economy:

  • In 1 minute, you can move a number of feet equal to your speed times 10.

  • In 1 hour, you can move a number of miles equal to your speed divided by 10.

Given the following parameters:

  • No teleportation

  • Regular (not difficult) terrain

  • The character level cannot be above level 12 (at level 13, casters gain teleportation magic, so this question becomes less relevant above level 12)

  • Consumables (spells, potions, etc) are allowed, but minimize the use of consumables; ie, between two answers giving the same distance traveled, if one uses less consumables, that one is the better answer

  • Magic items are allowed

  • Help from others is allowed (buffs, spells, items, etc) as long as those others are themselves at most level 12

What is the farthest someone can travel in 8 hours?