How long must you hold an instruction permit before applying for a driver’s license if you are under 18?

To apply for a driver's license in Illinois if you are under 18, you must hold your instruction permit for at least 9 months. This requirement is in place to ensure that young drivers gain sufficient driving experience under the supervision of an adult before obtaining a full license. During this 9-month period, new drivers are encouraged to practice their driving skills to enhance their readiness for independent driving. This time frame is part of the graduated licensing program, which aims to improve road safety by allowing young drivers to gradually gain experience.

Other durations are not correct because they do not meet the stipulated guidelines designed to ensure adequate training for young drivers.