My wilderness travel rules

OD&D and AD&D use a default wilderness scale of 1 hex = 5 miles. B/X and BECMI use a default scale of 1 hex = 6 miles.

In my personal game, I don't let my players see the hexes. Instead I let them choose a compass direction and a length (distance or time) in which they want to travel, and I then describe what they see and experience on the way. This roots them firmly in the perspective of their own character, instead of breaking immersion into a top-down map view, and they never see the changes in scale. Ideally, the experience for the players would be identical whether they are traveling across the overworld or through a dungeon.

On the DM side, I use hexes as handy boundaries for a collection of stuff. As the players' party enters a hex, I'll describe the features within the hex that they can see. This is similar to a videogame like Skyrim or GTA where, as the player avatar nears a location, the compass fills with icons of interesting things to do. In practice, this means telling the players something like "You see a stone tower off in the distance" or "You can see smoke rising from a firepit between a camp of tents", or "you can see a band of goblins down the path".

I never force my players to stick within the bounds of the hex. The PC party travels according to their own judgement and I simply describe what's nearby, even though they would actually be "between" two hexes.

A wilderness travel scale in terms of hours is useful for certain situations and types of terrain, but sometimes days is a more wieldly scale.

I haven't yet tested the mapping procedure for cities by individual streets that I described in this post, but I intend to subject some poor party to it anyway.