Ten million years, but rational people don't normally equate alcohol to illegal drugs. That just seems to be the pastime of the Libertarian dope promoters.
I also love how you think “60 years” equals “shortly thereafter”.
And there it is in a nutshell why you short term thinking people have no business tampering with social policy. You don't have a grasp of nations and peoples. You think everything revolves around your own existence and your own experiences.
Hate to break it to you, but it's not all about you and your whims.
Yes, 60 years is a very short time for a nation that has existed for nearly four thousand years.
There are no "illegal drugs", there are controlled substances.
For instance, a person can get a prescription for Desoxyn which is Methamphetamine Hydrochloride.
It isn't "illegal" at all or it couldn't be prescribed!