How long was Princess Diana Married?

Lady Diana Spencer married Prince Charles on July 29, 1981 at St. Paul's Cathedral. She and Charles separated in 1992 and in December of 1995, the Queen wrote to both of them advising they get a divorce. The divorce was finalized on August 28, 1995.

Therefore, Princess Diana was married for 14 years and 30 days, from 1981-1995.