Final answer:
The required holding period for a beginner's permit varies by location, typically ranging from 6 to 12 months in the U.S. Specific regulations depend on local laws, and the provided data does not include these details.
Step-by-step explanation:
The length of time a person must hold a beginner's permit before becoming eligible for a driver's license can vary greatly depending on the country, state, or region's specific laws and regulations. Unfortunately, without specifying a location, it's not possible to provide a precise number of days. For instance, in the United States, many states require that new drivers spend a certain period, typically around 6 to 12 months, practicing with a learner's permit before they can apply for a full license. This can be seen as a way to ensure that young drivers have adequate experience behind the wheel before driving independently.
On the other hand, the data provided regarding the ages at which teenagers obtain their driver's licenses across different regions of the country could be used for statistical analysis but does not give specific legal requirements for holding a learner's permit.