I can't even imagine how much time some of these maps have taken.
I have some that haven't been posted here that take the cake. Some maps are hard to finish cus they take so long.
I did a very large and involved height map which led to several other maps, concluding with a fully rendered satellite map.
Those spanned 3 years or so. I have no idea how much time went into each. It was a lot though.

It definitely surpassed the time spent on Haerlech, which was long.
I've had some other client maps I haven't shown that are also very long running.
Usually when I do the style I did for Nahadua, Qaliste, Anthropos, and such, it takes a very long time.
I tend not to post them for several reasons. But those definitely take the longest.