Final answer:
The length of driver's license revocation for a second zero tolerance violation depends on the specific laws of the state or country, which can be severe and vary widely. The provided excerpt does not offer details on revocation periods.
Step-by-step explanation:
The length of a driver's license revocation for a second zero tolerance violation can vary depending on the state or country's traffic laws. In general, a zero tolerance policy refers to stricter consequences for specific violations, especially for underage drinking and driving. However, the provided study excerpt does not contain information regarding driver's license revocation periods. Typically, drivers, especially underage ones, may face more severe penalties for each subsequent violation, possibly leading to revocation for several months to a year or more. To find the exact period of revocation, you would need to refer to the specific laws of the jurisdiction in question.