Part 1. Definition
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.  
Part 2. Example
Sentence: Namibia conducts a census every ten years. After independence the first Population and Housing Census was carried out in 1991, further rounds followed in 2001 and 2011. The data collection method is to count every person resident in Namibia on the census reference night, wherever they happen to be. This is called the de facto method. For enumeration purposes the country is demarcated into 4,042 enumeration areas. These areas do not overlap with constituency boundaries to get reliable data for election purposes as well. 
Question: How often does Namibia conduct a census?
Answer: every ten years
Explanation: Census is generally conducted every ten years in most countries like Namibia.
Part 3. Exercise
Sentence: With the new stadium, Barcelona participated in the inaugural version of the Pyrenees Cup, which, at the time, consisted of the best teams of Languedoc, Midi and Aquitaine (Southern France), the Basque Country and Catalonia; all were former members of the Marca Hispanica region. The contest was the most prestigious in that era. From the inaugural year in 1910 to 1913, Barcelona won the competition four consecutive times. Carles Comamala played an integral part of the four-time champion, managing the side along with Amechazurra and Jack Greenwell. The latter became the club's first full-time coach in 1917. The last edition was held in 1914 in the city of Barcelona, which local rivals Espanyol won. 
Question: How many times did Barcelona win the Pyrenees Cup?
Answer:
four