Averaged sized homes that do not require intensive painting can take anywhere from two to three days to spray the house's siding. A professional will first prime all areas of bare wood, metal rust, and hardie board, as well as high-gloss surfaces before spray painting the exterior with two coats of high-quality paint.

If you have the skills and time to do it properly, painting your own home can save money and provide a sense of accomplishment. Hiring a pro may be the wiser option if you don't possess the know-how or can't commit to investing in the necessary effort.