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.  

Ex Input:
Sentence: The club have entered the UK pop charts on four occasions under different titles during the 1980s and 1990s when many clubs released a song to mark their reaching the FA Cup Final. "The Boys in Blue", released in 1984, peaked at number 82. The following year the club scored their biggest hit when "Here We Go" peaked at 14. In 1986 the club released "Everybody's Cheering The Blues" which reached number 83. "All Together Now", a reworking of a song by Merseyside band The Farm, was released for the 1995 FA Cup Final and reached number 27. When the club next reached the 2009 FA Cup Final, the tradition had passed into history and no song was released. 
Question: How many times has the Everton FC entered the UK pop charts?

Ex Output:
four


Ex Input:
Sentence: The Melbourne rail network has its origins in privately built lines from the 1850s gold rush era, and today the suburban network consists of 209 suburban stations on 16 lines which radiate from the City Loop, a partially underground metro section of the network beneath the Central Business District (Hoddle Grid). Flinders Street Station is Melbourne's busiest railway station, and was the world's busiest passenger station in 1926. It remains a prominent Melbourne landmark and meeting place. The city has rail connections with regional Victorian cities, as well as direct interstate rail services to Sydney and Adelaide and beyond which depart from Melbourne's other major rail terminus, Southern Cross Station in Spencer Street. In the 2013–2014 financial year, the Melbourne rail network recorded 232.0 million passenger trips, the highest in its history. Many rail lines, along with dedicated lines and rail yards are also used for freight. The Overland to Adelaide departs Southern Cross twice a week, while the XPT to Sydney departs twice a day. 
Question: How often does the XPT to Sydney depart?

Ex Output:
twice a day


Ex Input:
Sentence: The Council does not have executive powers but meets biannually to discuss issues of mutual importance. Similarly, the Parliamentary Assembly has no legislative powers but investigates and collects witness evidence from the public on matters of mutual concern to its members. Reports on its findings are presented to the Governments of Ireland and the United Kingdom. During the February 2008 meeting of the British–Irish Council, it was agreed to set up a standing secretariat that would serve as a permanent 'civil service' for the Council. Leading on from developments in the British–Irish Council, the chair of the British–Irish Inter-Parliamentary Assembly, Niall Blaney, has suggested that the body should shadow the British–Irish Council's work. 
Question: How often does the British-Irish Council meet?

Ex Output:

biannually