Just the bottom box/lid is painted. The uprights and shingles on the roof are real wood.
Painting the box was easy. I bought three cans of flat spray paint, grey, tan and a darkish brown. I covered the pink with the grey first. I had some old yellow latex and some white latex that I mixed to make a light yellow. I used an old 3 inch wide flat paint brush and did lose strokes up/down. This gave the 'wood grain' look. I then went back over that with very light tan/brown spraypaint to give the wood color.
I then used two pieces of wood to make a 'template' for the vertical dark lines that indicate single pieces of wood. By laying these 'template' pieces next to each other with a 1/4 inch gap, I sprayed black paint (I had a can of black, so I didn't need to purchase this) between the gap. I then used a sharpie to draw in the knots.
I did it over a few days in my spare time. I don't have a total amount of hours calculated but it wasn't too many. and because I started two weeks before I needed it, I had plenty of time to think about each step before doing it.