You could do an extension that does it (via content edit handlers), but think about what it implies. XML block can have a a lot of different formating and tags (bold, italic, links, images, tables...).
You could be abkle to count the characters (by stripping away the tags) but how would you count the lines with all this?
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Nothing is impossible. Not if you can imagine it!
Hubert Farnsworth
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