It might feel like a lifelong project but it will be standing for many lifetimes.
When I was in Italy I asked about the roofs as everything is tiled and I asked how long they last. The Italian guy I was with told me last forever I kind of laughed and said nothing last forever and he said come with me. We drove a short way and got out and he said here is a very old roof it was put on in the 5th century, over here are new roofs 8th century.
Your wall might make it forever also. Look at how old the rocks are you are starting with.
Got a little more progress last week. The quarry I first got the rock from stopped making that size so I was stuck with smaller stones. It made it easier to move by hand but more time consuming to stack and I liked the look of the larger better.