The longest recorded time for someone to have the hiccups is 69 years!
This record was made by a man named Charles Osborne. He started hiccuping in 1922 while trying to weigh a 350 lb pig to be slaughtered. He couldn't stop until 1990. A letter was written to Dear Abby on his behalf, but she didn't have any advice for him.
During the first few decades, he hiccupped up to 40 times a minute, slowing to 20 a minute in later years. He hiccupped an estimated 430 million times, and died 11 months after his hiccups stopped.
Charles Osborne, however, did manage a somewhat ordinary life - he was married twice and had 8 children.
(Sources: 1, 2)