Final answer:
This question relates to the legal provisions in California for out-of-state visitors between 16-18 years old driving with their home state driver's license.
Step-by-step explanation:
The question asks about the duration that visitors between 16-18 years old can drive with their home state driver's license after arriving in California.
Unfortunately, this question does not relate explicitly to the reference information provided, which concerns Oregon's Motor Voter policy and a humanitarian situation involving young children.
Thus, the specific laws pertaining to how long a teenager can drive with an out-of-state license in California cannot be accurately answered based on the given references.
Generally, however, non-residents with a valid driver's license from their home state can drive in California for a limited time before they are required to obtain a California driver's license.