Need help with a map

I’m making a map for DND and originally this was going to be my world map however now that I made a ~1/2 inch grid on part of it looks like it’s more continent sized instead of world sized. Trying to math it out is just hurting my head so should it be world or continent size and if so how many miles should I put each square at since a person travels ~24 miles by horse/foot every 8 hrs. I want travel to be something that you can get from one end of the map to the other in about a week by train maybe but have the mountains take a week minimum from one end to the other.

I’m making a map for DND and originally this was going to be my world map however now that I made a ~1/2 inch grid on part of it looks like it’s more continent sized instead of world sized. Trying to math it out is just hurting my head so should it be world or continent size and if so how many miles should I put each square at since a person travels ~24 miles by horse/foot every 8 hrs. I want travel to be something that you can get from one end of the map to the other in about a week by train maybe but have the mountains take a week minimum from one end to the other.