Normally, on a DUI first the minimum punishment is two days in jail. If your blood alcohol level is .20 or higher then it's a minimum of seven days in jail. A DUI second offense is a minimum of 45 days in jail. A DUI third offense is a minimum of 120 days in jail. A DUI fourth offense of felony is a minimum of 150 days in jail. And a class C felony, a DUI is undetermined. It is a class C felony and that will be dependent on the range of punishment that the court gives you. The range, full range of punishment depending on your record is three to 15 years in jail.