mmm its sad this situation but at least you are just wanting to set them free from lies, you care deeply for the individual and in your mind the end result of seeing them happy is what matters.
Personally i'd take as long as it was needed to help my mum, she has no idea what she is in and its like a knife in your heart when they say your just against their faith. I hope one day she leaves, no matter what i present her with she closes her eyes but yet she's willing to show me 'her evidence' which is a claim by the society backed up by the society and then just to make its standing firm and undoubtable you open the insight book.