It is hard to give you exact answer. It is all depends on the meaning of sentence. I do not think it will be double, probably more like approx. the same...to estimate length of Russian sentence, your friend can go to http://translate.google.com/#en|ru|, enter English paragraph and view Russian translation.
In many cases it is very inaccurate (meaning of sentence), but it will be good enough for estimate length and amount of words.
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