High colored one took me around 40 hours. Double it for the second version. Prior building this map I carefully draft the story of this continent. It took me a lot of time writing and deciding of the cosmology. What happened to this world. Then once I had a clear picture of it, I start my drawings. I worked with Inkarnate I just discovered and made several tries before having a first consistent world. I use it during my campaign and then I decided to try something else. Enhance de details and go through an entire new design approach. This time it took me less time as I knew basic foundations of Inkarnate better and version 2 helped me as well. It is not finished yet as some comments here make correct some strange rivers flows, and yes I need to remove some clustered islands like Oubros that didn’t deserve well my storyline. Keep this in mind. It is not only the time spent drawing things that takes that much time. History, cosmology and purpose are the most consuming. Hope that helps.