In this task, we ask you to write an 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 answer. 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.

Sentence: One day, as Mary was picking the blueberries, she turned around to find that Max was not there. 
Question: How many times a day did Mary pick blueberries?
once
The story only mentions a single instance of Mary picking blueberries, which implies that she would have picked them once..