If you are convicted of a Hillsborough County DUI, the court may require an impoundment of your vehicle…. The length of time depends on the when and whether the person has prior DUI convictions. For example a first offense DUI conviction is a 10 day impoundment, a second DUI within 5 years of the first is a 30 day impoundment and a 3rd DUI conviction within 10 years of the second is a 90 day impoundment. The Judge in Hillsborough County can waive this requirement if someone in the Defendant’s family relies on the vehicle.