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Rich_G-
I think 10 minutes seems to work well for people. Setting out to do a quick drawing helps getting things going, but there's no point in stopping dead on the clock if you're enjoying yourself, or you've only got 1/4 of a drawing that you want to finish. On the other hand, there's nothing wrong with only doing 1/4 of a drawing.
The main goal is just doing a bit of something, to what extent you take it, is entirely up to you!
Nef
Try and draw something using tone rather than line. It's hard to avoid line completely, or at least the emergence of lines, but try and "build" the drawing with the different tones present on the object or scene.