Both short and long-term can be 0% if you don't bother to report the gains to the IRS. Plus, as an added benefit, you'll end up getting free room and board in prison, courtesy of those that do pay the tax.

Seriously, in order for a stock to be classified as long-term, you have to hold it for a minimum of 1 year, plus 1 day, or a total of 366 days, 367 if it's a leap year.