Final answer:
The length of license suspension for a driver under 21 who receives court supervision for an alcohol-related offense varies by state, but common suspension periods are 3 months, 6 months, 1 year, or 2 years.
Step-by-step explanation:
If a driver under the age of 21 receives court supervision for an alcohol-related offense, the specific consequences can vary by state due to differing enforcement of the National Minimum Drinking Age Act of 1984.
However, generally, there are predefined consequences such as license suspension, which are meant to dissuade underage drinking and driving.
The exact length of suspension could be 3 months, 6 months, 1 year, or 2 years depending on the jurisdiction.