There is no limit to the variations you can make in the charting, the number of inbetweens, or the drawings themselves. It is entirely up to you, bearing in mind the demands of the scene, or the director.
At this point you may ask: How many frames should a walk take? There is no easy answer to this question. A chirpy, nervous character, for example, will walk much faster than a slow, ponderous character. Everything is relative. As a general rule of thumb, however, a stereotyped "basic" walk can usually be drawn over eight frames of film per step.
A more natural, yet fast, walk can be drawn over twelve frames. (Remember: the faster the walk you are attempting, the fewer drawings you need—and the slower the walk, the more drawings you need.)
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