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Suki commented a couple of posts back, that these water colours that I love to do, most likely take longer to make than looks suggest.
It is true that each section needs to be painted, then dried properly before the next section can be painted. Otherwise the colour will then bleed into the damp section next to it. It then needs to be completely dry before adding more concentrated colour or ink for further decoration. It's possible though, to use a hairdryer to speed things up.
I usually go about housework, cooking, phone calls , sometimes another painting, in between, leaving the artwork out on the kitchen table so I can go back to it easily. It is slow, but I do love this technique, because it seems to suit the art that I make.