Darker colours dry in about a week. White and lighter colours will take longer. You can over paint any colour after about a day or so without it mixing and making a mess. If you get a towel and soak it in terps and rub it on your picture, you'll fetch off the paint no matter how long it' been on.
You only need about six colours. Black, White, brown, blue, yellow and red and with those you can mix just about any shade of any colour you need.
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