In this task, you're given passages that contain mentions of a time duration related quesry and we are supposed to write answer to a question that involves event “frequency", which refers to how often an event is likely to be repeated. For example, "taking showers" typically occurs ~5 times a week, "going to saturday market" usually happens every few weeks/months, etc. 
 Note that a lot of the questions could have more than one correct answers. We only need a single most-likely answer. Please try to keep your "answer" as simple as possible. Concise and simple "answer" is preferred over those complex and verbose ones.  
Q: Sentence: On 2 March 1979, the GPC announced the separation of government and revolution, the latter being represented by new Revolutionary Committees, who operated in tandem with the People's Committees in schools, universities, unions, the police force and the military. Dominated by revolutionary zealots, the Revolutionary Committees were led by Mohammad Maghgoub and a Central Coordinating Office, and met with Gaddafi annually. Publishing a weekly magazine The Green March (al-Zahf al-Akhdar), in October 1980 they took control of the press. Responsible for perpetuating revolutionary fervour, they performed ideological surveillance, later adopting a significant security role, making arrests and putting people on trial according to the "law of the revolution" (qanun al-thawra). With no legal code or safeguards, the administration of revolutionary justice was largely arbitrary and resulted in widespread abuses and the suppression of civil liberties: the "Green Terror." 
Question: How often was al-Zahf al-Akhdar published?
A: 
weekly