My next door neighbour is having some stone walls built, and their man (who I think is either Spanish or Portuguese) is a real craftsman.
He is slow, very slow; but every stone is studied and perfectly placed. He even manages to get the composition of colours right.
Nowadays, when building in stone, it is usually only the facade that is actual stone. A concrete block interior wall is built, then the stones laid in front. The space between blocks and stones is filled with whatever is to hand, mixed with concrete. You'd never know the difference.
I'm not sure yet what they're building, but as long as they're not in a hurry I reckon it'll look very good indeed. It's just a matter of getting 'Pedro' to turn up!
The above is about 6 months (occasional) work; or even more.