DWI, 1st Offense: Class B Misdemeanor. - Fine: A fine not to exceed $2,000.00. - Jail: Confinement in the County Jail for a term of not less than 72 hours nor more than six (6) months.- Open Container: If there was an open container of alcohol in your car when arrested, the minimum term of confinement is six (6) days in the county jail. - Community Service: Texas law mandates that a judge order not less than 24 hours nor more than 100 hours.Absent unusual facts, most persons convicted of a first offense DWI are granted community supervision (probation). The general length of DWI probation is two years.  There are also conditions of community supervision ordered that are fairly standard in most courts.  Typical conditions imposed are: Drug/Alcohol Evaluation, Alcohol Education, and attendance at a MADD Victim Impact Panel.