12 edges.
http://wiki.answers.com/Q/How_many_edges_are_there...

The best way to answer this question is to pick one up and count. First you have to know what each shape is! A cube is like a die you roll in games. (2 of them are called dice) It
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A cube is a perfect cuboid. Consider it's shape: two squares attached to each other by four legs, outside corner to outside corner. So, two squares have 4 edges each = 8 edges. And,
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A cuboid (rectangular prism) has 4 faces of equal size, and 2 other faces of a different size (3d rectangle). It has a total of 12 edges.
http://www.kgbanswers.co.uk/howmanyedgesdoesa...
