Final answer:
When practicing with an adult supervising driver, you must practice for at least 3 months and observe driving rules and regulations.
Step-by-step explanation:
When practicing with an adult supervising driver, you must practice at least 3 months and must observe driving rules and regulations. This is to ensure that you gain enough experience and knowledge to safely operate a vehicle on your own. During the practice period, it's important to follow the instructions of your supervising driver, adhere to traffic laws, and always prioritize safety.