At the intersection of psychology, neurobiology, and social behavior lies the complex issue of alcohol dependency. The labyrinth of alcohol addiction is packed with emotional turmoil, physical distress, and a significant societal stigma. Recovery from such a scenario demands an integrated approach, combining medical, psychological and social support systems. This is where the necessity of Alcohol Rehab is underscored.

Firstly, let's elaborate on the concept of Alcohol Rehab. It is a comprehensive process aimed specifically at individuals suffering from alcohol addiction. Over a given period, a combination of medical, psychological, and social strategies are deployed to help the individual regain control of their life. However, the efficacy of this process doesn't just rest upon the number of days spent within rehab or the professionalism of the caregivers. It hinges critically on the timing. The sooner an individual enters rehab, the higher the chances of successful recovery.

To grasp the rationale behind this, we can turn our attention to the progressive nature of alcohol dependency. According to the Jellinek's curve, a model proposed by E. Morton Jellinek, a pioneer in the field of alcoholism, the course of addiction follows a predictable path. It starts with occasional indulgence, moves to regular consumption, and finally spirals into complete dependency. The transition through these stages is accompanied by a significant alteration in the brain's neural pathways, predominantly involving reward and stress circuits. As an individual progresses through these stages, the neural alterations become more entrenched, making the journey back to sobriety increasingly challenging.

The human brain, however, is not a static entity. It's a dynamic organ with the capacity to rewire its connections, a phenomenon known as neuroplasticity. Medical interventions in alcohol rehab, such as detoxification and medication, can halt the deleterious impact of alcohol, thus paving the way for the brain's self-healing process. Concurrent psychological therapies can significantly foster this healing process by enhancing cognitive resilience and adaptive coping mechanisms.

To illustrate the impact of timing on success rates, let's delve into the realm of statistics. A study published in the journal Addiction found that patients who enter alcohol rehab within the first year of their dependency have a success rate of around 60%. However, this figure plummets to 34% for those who wait for five years or more. In essence, the window of opportunity for successful recovery narrows as time progresses.

Apart from the biological aspects, social factors play a pivotal role in the success of alcohol rehab. The stigma associated with alcohol dependency often deters individuals from seeking help. Early intervention, therefore, not only provides a medical advantage but also circumvents the entrenchment of this societal bias.

The importance of early intervention is further emphasized by the economic impact of alcohol addiction. According to the Centers for Disease Control and Prevention, excessive alcohol use costs the US economy around $249 billion annually, mainly due to lost productivity and healthcare expenses. Early rehab can mitigate these costs by hastening recovery and reducing the chances of relapse.

Moreover, alcohol addiction has rippling effects on families, relationships, and society as a whole. It contributes to the perpetuation of violence, broken homes, and social instability. By opting for rehab at an early stage, an individual not only salvages their life but also aids in the creation of a healthier society.

While it's true that overcoming alcohol addiction is a battle fought within the confines of one's mind, the arsenal required to triumph in this battle is found within the walls of a rehabilitation center. To reap the maximum benefits, however, it's imperative to start the journey sooner rather than later.

In conclusion, the reasons to opt for alcohol rehab now are manifold and compelling. It offers an opportunity to halt the progression of addiction, enhance neuroplasticity, improve success rates, circumvent societal stigma, mitigate economic costs, and contribute positively to societal health. Remember, the journey towards recovery is not a race against time, but rather a timely action that enhances the quality of life.