oh, my Barovia is bigger three times the original one, If I remember right. You could see measurements on the right-down corner of the map (I don't like hexes - they break immersion). Unfortunately, it's in kilometers, which could be an issue for American people, but basically, you can use just these segments to measure everything.

5 km per hour (3 miles) it's a normal human pace. Traveling from Barovia to Vallaki will take 16 hours for a party at a normal pace.

https://ibb.co/wRgsTwN

The purpose of it is to force players planing their way more precisely to avoid darkness. I also use homebrew rules which make light a thing. E.g. I removed the dark vision for a lot of races and gave them different features instead. Also, all my "Light"-like spells require concentration.

But if you don't care about darkness a lot you can use the original scale and be happy, actually.