Here's a massive spreadsheet / calculator for Travian I built years ago. Some things may have changed in 8 years but I've been using it the past few weeks and it looks
GitHub - kirilloid/travian: Set of utilities for the Travian online game.
Travian Kilroid
Ten Days Domination Guide | Travian Strategy Guide
How distance and time work in Travian | Bananatic
Travel time calculator for Travian 3
Final Server ROX40 – Travian ROX Blog
GitHub - Arandia/travian-distance-time-calculator: Adds mouseovers to the map to show the distance/time for units to reach
Travian Answers
Travian ROX Blog – Page 142 – Travian rox runda a 41-a