how long would it take for bells palsy to kill the facial nerve?

gotanypostits

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one of my friends has been diagnosed with bell palsy. i have been doing alot of reading about it but i havent been able to find how long it might take for a constrained nerve to die.
i know people have recovered completley as long as 6 months after the onset of bells palsy. but how long would a nerve have to be constrained for it to die. im guessing that it depends on the degree of swelling of the nerve but in general how sever would the swelling have to be and how long would it take for serious damage to be caused to the nerve???
 
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