The advocates of Prohibition had waged a 50-year campaign to ban alcohol and had high hopes for this "The Noble Experiment." Supporters anticipated that alcohol's banishment would lead to the eradication of poverty and vice while simultaneously ennobling the common man to achieve his highest goals. The reality of Prohibition was to prove quite different.

http://www.eyewitnesstohistory.com/snpmech2.htm

So it lasted for about 50 years? How long has the current prohibition been going on?