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Answer:

Obviously the answer varies with how heavy a mark you leave and the length of the pencil. Start by assuming that a pencil is 17 cm long and has a diameter of 0.2 cm (which gives a volume of just under 0.55 cm3. If you just touch the paper so the line is 1 layer of carbon atoms thick (about 1 nm) and the full 0,2 cm wide the line would be somewhat under 300 km (180 mi) long. Application of some skill in twisting the pencil so the line is thinner could double or triple the line length.

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