If you do decide to make it a full-time business, the sky’s the limit. The house flipper/contractor that I worked for billed clients $35 per hour for painting, and paid his best painters perhaps half of that, so there is room for some profit there. Consider the case of Matt Shoup, who started with $100 and went door-to-door, asking neighbors if they needed some painting done, then built a painting business that earns $2.5 million per year!
If you're going to do any part of the painting or prep work on your own, you must know that the first step in preparing a surface is washing it. Since dirt can affect the smoothness of a surface area -- and therefore paint's adhesion to it -- use soap to remove any dirt or stains. Make sure there's no soap left on the walls when you're finished; also make sure to remove any gloss with sandpaper and vacuum up the leftover dust.
When the workers came they took care of all the stuff I'd seen other reviewers mention, removing old phone lines, some stucco work, but one thing I didn't expect is that one of my awnings had some dry rot that I'd planned to get fixed. There was slight language barrier but the workers took it into their own hands to saw off and repair the awning before painting it. Wow!
Beginning with the prep work and ending with last coat of paint or the finishing, an exterior paint job will last anywhere from one to two weeks. After completion, homeowners using low-quality paint will need to repaint every four or five years to keep it well maintained; homeowners using high-quality paint can go longer without a new coat -- usually about seven or eight years, depending on the type of paint and material.