The extended time was one year. I guess I worked three days a week from 11 to 5.
Architecture always takes a long time.
This drawing was very important because in this picture lineal perspective was very important. The viewing size of the support is 60 degrees, the left and right vanishing points are 90 degrees apart on the horizon line. I made a tool to keep it all accurate. You can make one too, the instructions are in my course, in the Painting on Location section, Perspective. Those warm darks are made from the combination of the opposition Yellow and Blue.