You do not know, and the readers cannot tell you, what they might like until they have it. It is one of those things that particularly if you want to be the next wave, well the next wave is not already on the bestseller lists. The next wave is in somebody's head.
In my works, the geography map-wise is accurate - roads are where I say they are, and go from this town to the next as I say they do, and yes, it would take a curricle that long to travel that distance.