To be honest I'm not sure if it stacks or not. I'm not even sure which duration it was given. Wiki listed 2. Nearly 1 hour and another for 6 minutes. I believe it's supposed to be 1 hour. Otherwise what would be the point. But I think the dev's probably put it in for 6 minutes because no one took the time to research the spell thoroughly. If someone found information on it in classic era the spell may be resurrected from the last page of spell books.
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