I did the same thing for last year's big bang: look at the kingdom of Albion, then at a modern map, look at places that are relatively where I want my characters to be at certain points, look up how far apart those places are, see how long it would take to travel on horseback, add a day or two for breaks, and, well, the fact that they're not going in a straight line... all so I could say "Yep that happened in about 2-3 weeks." It wasn't nearly as accurate and I don't think anyone cares, but it was really fun, I have to admit. It's so hard not to get lost when you're looking up those things.

Thank you for sharing this, and good luck with your writing! :'D