Below are some articles I have pasted about the ability of the brain to rewire in 90 days.  Although 90 meetings in 90 days and 90 day treatment programs have been part of the narrative of recovery for half a century, solid research is now emerging giving support to the experience of sobriety.

 “In fact, some researchers believe that it can take up to two years for certain chemically-compromised regions of the brain to return to normal. There is also growing evidence that on average, it takes about 90 days for the brain to break free of the immediate effects of the drug and reset itself. Researchers at Yale University call this 90-to-100 day period the “sleeper effect,” a time during which the brain’s proper analytical and decision-making functions gradually recover. That Alcoholics Anonymous recommends newbies to attend a meeting a day for the first 90 days of their recovery might just be a curious coincidence—or a precient prediction of much-later scientific studies.”  https://www.thefix.com/content/one-big-pain-brain

“One important discovery: evidence is building to support the 90-day rehabilitation model, which was stumbled upon by AA (new members are advised to attend a meeting a day for the first 90 days) and is the duration of a typical stint in a drug-treatment program. It turns out that this is just about how long it takes for the brain to reset itself and shake off the immediate influence of a drug. Researchers at Yale University have documented what they call the sleeper effect–a gradual re-engaging of proper decision making and analytical functions in the brain’s prefrontal cortex–after an addict has abstained for at least 90 days.

This work has led to research on cognitive enhancers, or compounds that may amplify connections in the prefrontal cortex to speed up the natural reversal. Such enhancement would give the higher regions of the brain a fighting chance against the amygdala, a more basal region that plays a role in priming the dopamine-reward system when certain cues suggest imminent pleasure–anything from the sight of white powder that looks like cocaine to spending time with friends you used to drink with. It’s that conditioned reflex–identical to the one that caused Ivan Pavlov’s famed dog to salivate at the ringing of a bell after it learned to associate the sound with food–that unleashes a craving. And it’s that phenomenon that was the purpose of my brain scans at McLean, one of the world’s premier centers for addiction research.”

http://content.time.com/time/subscriber/article/0,33009,1640436-3,00.html

“Researchers at Yale University have documented what they call the sleeper effect–a gradual re-engaging of proper decision making and analytical functions in the brain’s prefrontal cortex–after a drug addict or alcoholic has abstained for at least 90-days. From the July 05, 2007 issue of Time Magazine’s cover story, “How We Get Addicted” by Michae, D. Lemonick ‘Research shows that the prefrontal cortex of the brain is very important in sustaining substance abuse sobriety because it helps you control your impulses and refrain from alcoholism and drug abuse. It takes at least 90-days for it to re-engage.'”