Passage: Oli began his political career in 1966 in opposition to the party-less Panchayat System in place at the time. He joined the Communist Party of Nepal in February 1970.  He became involved in subversive politics and was arrested for the first time in 1970. A year later he became a district committee member of the party and soon the chief of the Jhapa Movement Organizing Committee in 1972. Oli was imprisoned for 14 consecutive years from 1973 to 1987. After his release from prison in 1987, he became a central committee member of UML  in-charge of the  Lumbini Zone until 1990.

Question: How long was Oli in prison?
14 consecutive years