A "limited time" -- Originally 14 years, renewable once to provide 28 years of protection.
Constitution gave Congress the power to determine what "limited" means.
Hollywood lobbyed Congress to extend the term.
As a result, extended 11 times in the last 40 years.
Currently 70 years after the death of the creator.
Work for hire - 95 years after first public distribution.
Effectively forever.
As a result of the last extension, nothing will go into the public domain for 18 years.