I think it depends on the person......they will maintain their need until things get worse. I think it really depends on a host of factors.
My wife has had 3 DWI's in one year. The first one she blew a 2.0 and past the feild sobriety test. And she is tiny! I would be on my ass!
Her last one was 1.5. She was showing no obvious signs of intoxication. Pulled for a seatbelt violation.
She will have to go to jail. Maybe there she will find her bottom....or maybe not. I give it 50% odds of quitting.