Trademark rights can last indefinitely if the trademark
owner continues to use the mark to identify goods or services.
According to United States Patent and Trademark Office. The term of a
federal trademark registration is 10 years, with 10-year renewal terms.
However, between the fifth and sixth year after the date of initial
registration, the registrant must file an affidavit setting forth
certain information to keep the registration alive. If no affidavit is
filed, the registration is canceled.