Originally Posted by
LexieCat 
NOBODY can predict that. Every situation and individual is different.
Is this his regular psychiatrist he's supposed to see tomorrow, or is this a new appointment he's supposedly made? I'm saying "supposedly" because it isn't unusual for alcoholics to lie about these things. IF it's a regular appointment with a psychiatrist he's been seeing, then it might be worth cluing the doctor in, explaining that he doesn't know about the planned intervention.
As for how long you might have to stay with your Aunt, same thing--no one here can predict.
I'd just suggest keeping your expectations for this VERY low.
He has seen this psychiatrist once or twice (back in fall 2016) before he stopped going. I think he is going again for the purpose of getting anti-depressants. I don't want to tip him off in any way that this intervention is happening, for fear that he won't be at the apartment during the time of the intervention.
I am going to keep my expectations low. Either way, something new will happen and I wasn't able to continue living the way things were going.