The length of any suspension depends on various factors such as whether there was a refusal to submit to a chemical test, the number of previous charges, etc. If the driver requests a license hearing in time, generally speaking, the hearing officer will decide whether the officer had reasonable grounds to believe you were driving the vehicle, whether the arrest was proper, and whether the driver’s blood alcohol content was .08 or more.
If there was no chemical test, then the Judge has to decide whether the officer had reasonable grounds to believe you were driving the vehicle, whether the arrest was proper, and the refusal issue (i.e., whether the driver actually refused to submit to a post-arrest chemical test).