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.  

Let me give you an 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?
The answer to this example can be: every ten years
Here is why: Census is generally conducted every ten years in most countries like Namibia.

OK. solve this:
Sentence: Since Elizabeth rarely gives interviews, little is known of her personal feelings. As a constitutional monarch, she has not expressed her own political opinions in a public forum. She does have a deep sense of religious and civic duty, and takes her coronation oath seriously. Aside from her official religious role as Supreme Governor of the established Church of England, she is personally a member of that church and the national Church of Scotland. She has demonstrated support for inter-faith relations and has met with leaders of other churches and religions, including five popes: Pius XII, John XXIII, John Paul II, Benedict XVI and Francis. A personal note about her faith often features in her annual Christmas message broadcast to the Commonwealth. In 2000, she spoke about the theological significance of the millennium marking the 2000th anniversary of the birth of Jesus: 
Question: How often does Elizabeth give interviews?
Answer:
rarely