I also managed to spray our house in a weekend. Herself was mixing and refilling the bucket under the sprayer, and I did the spraying. Spent a week before masking off the entire area (windows, doors etc.)
Lesson Learned: Check with your plasterer to see what type of corner beading he used. There are plastic or metal ones. Our guy used the plastic ones outside and the metal ones inside. Two weeks after spraying, every corner in the house began to rust - water based paint on metal!. We found out later that we should have painted every corner with an oil based undercoat - then followed on top of that with the spraying